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proc-rota/shifts.py
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Ross cbe99ea3d8 .
2022-01-30 21:23:58 +00:00

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import datetime
import itertools
from typing import Dict, Iterable, List, Sequence, Tuple, Set
import datetime
from pyomo.environ import *
from pyomo.opt import SolverFactory
from workers import Worker
import json
import csv
from collections import defaultdict
from io import StringIO
import sys
ShiftName = str
DayStr = str
WeekInt = int
days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
full_weekend_count = 2
# Load uk based bank holidays
from govuk_bank_holidays.bank_holidays import BankHolidays
bank_holidays = BankHolidays()
bank_holiday_map = {}
for bank_holiday in bank_holidays.get_holidays(division="england-and-wales"):
bank_holiday_map[bank_holiday["date"]] = bank_holiday["title"]
SHIFT_BOUNDS = {
"bank_holiday": (0, 4),
"shift_count": (0, 400),
"night_shift_count": (0, 19),
"weekend_count": (0, 60),
}
class SingleShift(object):
"""Class to hold all details for a shift
Valid constraints
balance_across_groups (requires block assignment)
postclear(2) / preclear(2)
limit_grade_number:
options: {grade: max_number, grade2: max_number2}
minimum_grade_number:
options: (grade, min_number)
"""
def __init__(
self,
sites: Iterable[str],
name: str,
length: float,
shift_days: Sequence[str],
# balance_by_site=True,
balance_offset: float = 2, # this could be generated dynamically
balance_weighting: float = 1,
workers_required: float = 1,
rota_on_nwds: bool = False,
assign_as_block: bool = False,
force_as_block: bool = False,
force_as_block_unless_nwd: bool = False,
hard_constrain_shift: bool = True,
bank_holidays_only: bool = False,
constraints: Iterable[str] = [],
):
self.site = sites
self.name = name
self.length = length
self.shift_days = shift_days
# self.balance_by_site = balance_by_site
# balance_offset defines the max difference in allocated shifts
# versus target shifts (hard constraint)
# if 0 exactly equal shifts must be assigend (unlikely to be possible)
self.balance_offset = balance_offset
# weight the shift for balancing, default is 1
self.balance_weighting = balance_weighting
self.hard_constrain_shift = hard_constrain_shift
self.workers_required = workers_required
self.rota_on_nwds = rota_on_nwds
self.assign_as_block = assign_as_block
self.force_as_block = force_as_block
self.force_as_block_unless_nwd = force_as_block_unless_nwd
self.constraint_options = {}
self.constraints = []
for c in constraints:
match c:
case (constraint, options):
self.constraints.append(constraint)
self.constraint_options[constraint] = options
case constraint:
self.constraints.append(constraint)
self.bank_holidays_only = bank_holidays_only
# self.total_shifts = length * len(days) * len(shift_days)
def __str__(self):
return f"name: {self.name}, site: {self.site}, length: {self.length}, balance weighting: {self.balance_weighting}, balance offset: {self.balance_offset}, hard_constrain: {self.hard_constrain_shift}, workers required : {self.workers_required}, rota on nwds {self.rota_on_nwds}, assign as block: {self.assign_as_block}, force as block: {self.force_as_block}, constraints: {self.constraints}" # , total shifts: {self.total_shifts}"
def get_shift_summary(self):
"""
Returns a text summary of the shift
"""
return f"{self.name}: {self.workers_required} workers for sites ({', '.join(self.site)}) on days ({', '.join(self.shift_days)})"
class RotaBuilder(object):
"""Class to hold and manipulate shifts"""
def __init__(
self,
start_date: datetime.datetime = datetime.datetime.now(),
weeks_to_rota: int = 26,
balance_offset_modifier: int = 1,
ltft_balance_offset: int = 1,
max_night_frequency: int = 2,
max_weekend_frequency: int = 1, # Requires balance weekends
use_previous_shifts: bool = False,
use_shift_balance_extra: bool = False,
use_bank_holiday_extra: bool = False,
):
print(f"Start time: {datetime.datetime.now()}")
print(f"Weeks to rota: {weeks_to_rota}")
print(f"Use previous shifts {use_previous_shifts}")
print(f"Use previous shifts (balance_extra) {use_shift_balance_extra}")
self.shifts = [] # type List[SingleShift]
self.days = days
self.weeks = [i for i in range(1, weeks_to_rota + 1)]
self.weeks_days_product = list(itertools.product(self.weeks, days))
self.use_previous_shifts = use_previous_shifts
self.use_shift_balance_extra = use_shift_balance_extra
self.use_bank_holiday_extra = use_bank_holiday_extra
if start_date.weekday() != 0:
raise ValueError(
f"Start date {start_date.isoformat()} must be a Mon (not a {days[start_date.weekday()]})"
)
self.start_date = start_date
self.rota_days_length = len(self.weeks) * 7
self.rota_end_date = self.start_date + datetime.timedelta(self.rota_days_length)
self.unavailable_to_work = set()
self.unavailable_to_work_reason = {}
self.pref_not_to_work = {}
self.work_requests = set()
self.work_requests_map = {}
self.workers = []
self.worker_pairs = []
# self.night_blocks = ["weekday", "weekend", "none"]
self.sites = None
self.balance_offset_modifier = balance_offset_modifier
self.ltft_balance_offset = ltft_balance_offset
# Don't assign multiple shifts every (n) weeks
self.max_night_frequency = max_night_frequency
self.max_weekend_frequency = max_weekend_frequency
self.constraint_options = {
"ensure_1_st4_plus_on_nights": True,
"ensure_derriford_reg_for_nights": True,
"balance_nights": True,
"constrain_time_off_after_nights": True,
"balance_nights_across_sites": True,
"balance_bank_holidays": True,
"balance_blocks": True,
"balance_shifts": True, # Does not use a quadratic function
"balance_shifts_quadratic": False,
"balance_shifts_over_workers": True,
"minimise_shift_diffs": False, # less sophisticated version of balance_shifts_over_workers
"balance_weekends": True,
"max_weekends": 100,
"max_shifts_per_week": 7,
"max_shifts_per_month": 40,
"prevent_monday_after_full_weekends": [],
"prevent_monday_and_tuesday_after_full_weekends": [],
"prevent_fridays_before_full_weekends": [],
"prevent_thursdays_before_full_weekends": [],
# This may be better defined on the shift?
"require_presence_at_site_overnight": [],
"avoid_st2_first_month": False,
"hard_constrain_pair_separation": False,
}
# Generate a map for week, day combinations to a given date
self.week_day_date_map = {}
n = 0
for week, day in self.get_week_day_combinations():
d = self.start_date + datetime.timedelta(n)
self.week_day_date_map[(week, day)] = d
n = n + 1
self.results = None
def solve_model(
self, solver: str = "cbc", use_neos: bool = False, options: dict = {}
):
print("Setting up solver")
self.opt = SolverFactory(solver)
print("Solving")
if use_neos:
solver_manager = SolverManagerFactory("neos") # Solve using neos server
# results = solver_manager.solve(Rota.model, opt=opt, logfile="test.log")
results = solver_manager.solve(
self.model, keepfiles=True, tee=True, opt=self.opt, logfile="test.log"
)
else:
results = self.opt.solve(
self.model,
tee=True,
options=options,
# options={
# "threads": 10,
# },
logfile="test.log",
)
self.results = results
print(results)
results.solver.status
if not results.solver.status:
sys.exit(0)
def build_and_solve(self, options={"ratio": 0.1, "seconds": 1000, "threads": 10}):
self.build_shifts()
self.build_workers()
self.build_model()
self.solve_model(options=options)
def build_model(self):
# Initialize model
self.model = ConcreteModel()
# binary variables representing if a worker is scheduled somewhere
# NOTE: this will assign to all possible shift combinations (which we probably don't want)
self.model.works = Var(
(
(worker.id, week, day, shiftname)
for worker in self.workers
for week, day, shiftname in self.get_all_shiftname_combinations()
),
within=Binary,
initialize=0,
)
# The nights self.model is used to ensure nights are assigned as a block (and limit the number of workers required)
# self.model.nights = Var(
# ((worker.id, week, block) for worker in self.workers
# for week in self.weeks for block in self.night_blocks),
# within=Binary,
# initialize=0,
# )
# The nights self.model is used to ensure nights are assigned as a block (and limit the number of workers required)
self.model.shift_week_worker_assigned = Var(
(
(shift, week, worker.id)
for worker in self.workers
for week in self.weeks
for shift in self.get_shift_names()
),
within=Binary,
initialize=0,
)
self.model.worker_block_shift_split = Var(
(
(week, shift)
for week in self.weeks
for shift in self.shifts_to_assign_or_force_as_blocks()
),
within=Binary,
initialize=0,
)
self.model.blocks_worker_shift_assigned = Var(
(
(worker.id, week, shift)
for worker in self.workers
for week in self.weeks
for shift in self.shifts_to_assign_or_force_as_blocks()
),
within=Binary,
initialize=0,
)
self.model.blocks_assigned = Var(
(
(week, shift)
for week in self.weeks
for shift in self.shifts_to_assign_or_force_as_blocks()
),
within=NonNegativeIntegers,
initialize=0,
)
if self.constraint_options["balance_bank_holidays"]:
# Bank holidays
self.model.bank_holiday_count = Var(
((worker.id) for worker in self.workers),
within=NonNegativeIntegers,
initialize=0,
bounds=SHIFT_BOUNDS["bank_holiday"],
)
self.model.bank_holiday_count_w = Var(
((worker.id) for worker in self.workers),
within=NonNegativeIntegers,
initialize=0,
)
# self.model.bank_holiday_count = Var(
# ((worker.id, week, day) for worker in self.workers
# for week, day in self.get_week_day_combinations() if self.week_day_date_map[(week, day)] in bank_holiday_map
# ),
# within=Binary,
# initialize=0,
# )
# Used to limit number of workers on night shift per site
# if we force a binary it will in effect hard constrain to < 2
# from a single site
if self.constraint_options["balance_nights_across_sites"]:
self.model.night_per_site = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("night")
),
# within=Binary,
within=NonNegativeIntegers,
initialize=0,
)
self.model.night_per_site_t1 = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("night")
),
domain=NonNegativeIntegers,
initialize=0,
)
self.model.night_per_site_t2 = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("night")
),
domain=NonNegativeIntegers,
initialize=0,
)
# Replacement for balance_nights_across_sites
self.model.shift_per_site = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("balance_across_groups")
),
# within=Binary,
within=NonNegativeIntegers,
initialize=0,
)
self.model.shift_per_site_t1 = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("balance_across_groups")
),
domain=NonNegativeIntegers,
initialize=0,
)
self.model.shift_per_site_t2 = Var(
(
(week, shift.name, site)
for site in self.sites
for week in self.weeks
for shift in self.get_shifts_with_constraint("balance_across_groups")
),
domain=NonNegativeIntegers,
initialize=0,
)
self.model.shift_count = Var(
(
(worker.id, shift)
for worker in self.workers
for shift in self.get_shift_names()
),
domain=NonNegativeReals,
initialize=0,
bounds=SHIFT_BOUNDS["shift_count"],
)
self.model.shift_count_diff = Var(
(
(worker.id, shift)
for worker in self.workers
for shift in self.get_shift_names()
),
within=Reals,
initialize=0,
)
self.model.shift_count_diff_summed = Var(
(worker.id for worker in self.workers),
within=Reals,
initialize=0,
)
if self.constraint_options["balance_shifts_over_workers"]:
self.model.worker_shift_count_t1 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
self.model.worker_shift_count_t2 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
if self.constraint_options["balance_shifts"] or self.constraint_options["balance_shifts_quadratic"]:
self.model.shift_count_t1 = Var(
(
(worker.id, shift.name)
for worker in self.workers
for shift in self.get_shifts()
),
domain=NonNegativeReals,
initialize=0,
)
self.model.shift_count_t2 = Var(
(
(worker.id, shift.name)
for worker in self.workers
for shift in self.get_shifts()
),
domain=NonNegativeReals,
initialize=0,
)
if self.constraint_options["balance_shifts_quadratic"]:
self.model.shift_count_w = Var(
(
(worker.id, shift.name)
for worker in self.workers
for shift in self.get_shifts()
),
domain=NonNegativeReals,
initialize=0,
)
if self.constraint_options["balance_nights"]:
# We also try to even out the night shifts seperately
self.model.night_shift_count = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
bounds=SHIFT_BOUNDS["night_shift_count"],
)
self.model.night_shift_count_t1 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
self.model.night_shift_count_t2 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
self.model.night_shift_count_w = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
# self.model.worker_weekend_assigned = Var(
# ((worker.id, week) for worker in self.workers
# for week in self.weeks),
# domain=NonNegativeReals,
# initialize=0,
# )
# self.model.works_weekend_count = Var(
# ((worker.id, week) for worker in self.workers
# for week in self.weeks),
# domain=NonNegativeIntegers,
# initialize=0,
# )
# self.model.works_saturday = Var(
# ((worker.id, week) for worker in self.workers
# for week in self.weeks),
# domain=Binary,
# initialize=0,
# )
# self.model.works_sunday = Var(
# ((worker.id, week) for worker in self.workers
# for week in self.weeks),
# domain=Binary,
# initialize=0,
# )
# self.model.works_whole_weekend = Var(
# ((worker.id, week) for worker in self.workers
# for week in self.weeks),
# domain=Binary,
# initialize=0,
# )
self.model.works_weekend = Var(
((worker.id, week) for worker in self.workers for week in self.weeks),
domain=Binary,
initialize=0,
)
self.model.worker_weekend_count = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeIntegers,
initialize=0,
bounds=SHIFT_BOUNDS["weekend_count"],
)
if self.constraint_options["balance_weekends"]:
self.model.weekend_shift_count_t1 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
self.model.weekend_shift_count_t2 = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
self.model.weekend_shift_count_w = Var(
((worker.id) for worker in self.workers),
domain=NonNegativeReals,
initialize=0,
)
# self.model.weekend_count_t1 = Var(
# ((worker.id) for worker in self.workers),
# domain=NonNegativeReals,
# initialize=0,
# )
# self.model.weekend_count_t2 = Var(
# ((worker.id) for worker in self.workers),
# domain=NonNegativeReals,
# initialize=0,
# )
# self.model.unavailable = Var(((worker, week, day) for worker in self.workers for week in weeks for day in days),
# within=Binary, initialize=0)
def availability_init(model, wid, week, day):
if (wid, week, day) in self.unavailable_to_work:
# print((wid, week, day))
return 0
return 1
self.model.available = Param(
(
(worker.id, week, day)
for worker in self.workers
for week, day in self.get_week_day_combinations()
),
initialize=availability_init,
)
def work_request_init(model, wid, week, day, shift):
if (wid, week, day, shift) in self.work_requests:
self.work_requests_map[(wid, week, day)] = shift
return 1
return 0
self.model.work_requests = Param(
(
(worker.id, week, day, shift)
for worker in self.workers
for week, day, shift in self.get_all_shiftname_combinations()
),
initialize=work_request_init,
)
def pref_init(model, wid, week, day):
if (wid, week, day) in self.pref_not_to_work:
return self.pref_not_to_work[(wid, week, day)]
return 0
# It would also be possible to assign sequential days as blocks
# which would allow more weight to be given if the whole block
# is not allocated
self.model.pref_not_to_work = Param(
(
(worker.id, week, day)
for worker in self.workers
for week, day in self.get_week_day_combinations()
),
initialize=pref_init,
)
# binary variables representing if a worker is necessary
# self.model.needed = Var([worker.id for worker in self.workers], within=Binary, initialize=0)
# binary variables representing if a worker worked on sunday but not on saturday (avoid if possible)
# self.model.no_pref = Var([worker.id for worker in self.workers], within=Binary, initialize=0)
self.build_model_constraints()
def build_model_constraints(self):
self.model.constraints = ConstraintList() # Create a set of constraints
# Ensure each shift has the requisit number of workers assigned
for (
week,
day,
shift,
workers_required,
site_required,
) in self.get_required_workers_and_site_combinations():
# print(week, day, shift, workers_required, site_required)
self.model.constraints.add(
workers_required
== sum(
self.model.works[worker.id, week, day, shift]
for worker in self.workers
if worker.site in site_required
)
)
# And it is not assigned if the worker is from the wrong site
if [worker for worker in self.workers if worker.site not in site_required]:
self.model.constraints.add(
0
== sum(
self.model.works[worker.id, week, day, shift]
for worker in self.workers
if worker.site not in site_required
)
)
# # Ensure shifts are only assigned by workers from the allowed sites
# self.model.constraints.add(0 == sum(
# self.model.works[worker.id, week, day, shift]
# for worker in self.workers if worker.site not in site_required))
# THIS SHOULD NO LONGER BE REQUIRED
# Ensure no workers are assigned to shifts that are not required
#for week, day, shift in self.get_not_required_shifts():
# self.model.constraints.add(
# 0
# == sum(
# self.model.works[worker.id, week, day, shift.name]
# for worker in self.workers
# )
# )
# Constraint: total hours worked hours worked
# for worker in self.workers:
# self.model.constraints.add(
# 1200 >= sum(shift_lengths[shift] * self.model.works[worker, week, day, shift] for week in weeks for day in days for shift in days_shifts[day])
# )
# for week in weeks:
# for worker in self.workers:
# self.model.constraints.add(
# 48 >= sum(shift_lengths[shift] * self.model.works[worker, week, day, shift] for day in days for shift in days_shifts[day])
# )
# Define a maximum number hours that can be worked per week
# NOTE: this works on a calander week not a 7 day period
# TODO: consider fixing
# def maxHoursPerWeekRule(model, wid, week):
# return 72 >= sum(
# shift.length * model.works[wid, week, day, shift.name]
# for day, shift in self.get_day_shiftclass_combinations())
# self.model.max_hours_per_week_constraint = Constraint(
# [worker.id for worker in self.workers],
# self.weeks,
# rule=maxHoursPerWeekRule)
# Define an upper limit for hours worked over the rota period
# def maxHoursRule(model, wid):
# return 8000 >= sum(
# shift.length * model.works[wid, week, day, shift.name]
# for week, day, shift in self.get_all_shiftclass_combinations())
# self.model.max_hours_constraint = Constraint(
# [worker.id for worker in self.workers], rule=maxHoursRule)
# Limit grades
def limitGradesRule(model, week, shift, grade, limit):
workers = [w for w in self.workers if w.grade == grade]
if not workers:
return Constraint.Skip
return (
sum(
model.shift_week_worker_assigned[shift.name, week, w.id]
for w in workers
)
<= limit
)
for shift in self.get_shifts_with_constraint("limit_grade_number"):
if not shift.constraint_options["limit_grade_number"]:
raise ValueError("Constraint option must be defined for 'limit_grade_number'")
for grade in shift.constraint_options["limit_grade_number"]:
#self.model.limit_grades_constraint = Constraint(
setattr(self.model, f"limit_grades_constraint_{shift.name}_{grade}", Constraint(
[week for week in self.weeks],
#[shift for shift in self.get_shifts_with_constraint("limit_grade_number")],
[shift],
[grade],
[shift.constraint_options["limit_grade_number"][grade]],
rule=limitGradesRule,
#name=f"limit_grades_constraint_{shift.name}_{grade}"
))
def minimumGradesRule(model, week, shift, grade, limit):
workers = [w for w in self.workers if w.grade >= grade]
if len(workers) < limit:
#return Constraint.Skip
raise ValueError("minimum_grade_number: not enough valid workers")
return (
sum(
model.shift_week_worker_assigned[shift.name, week, w.id]
for w in workers
)
>= limit
)
for shift in self.get_shifts_with_constraint("minimum_grade_number"):
if not shift.constraint_options["minimum_grade_number"]:
raise ValueError("Constraint option must be defined for 'minimum_grade_number'")
grade, min_required = shift.constraint_options["minimum_grade_number"]
#self.model.limit_grades_constraint = Constraint(
setattr(self.model, f"minimum_grade_number_{shift.name}", Constraint(
[week for week in self.weeks],
#[shift for shift in self.get_shifts_with_constraint("limit_grade_number")],
[shift],
[grade],
[min_required],
rule=minimumGradesRule,
#name=f"limit_grades_constraint_{shift.name}_{grade}"
))
# def nightShiftDerrifordRule(model, week, shift):
# derriford_workers = [w for w in self.workers if w.night_at_derriford >= 1]
# # if not derriford_workers:
# # return Constraint.Skip
# return (
# sum(
# model.shift_week_worker_assigned[shift, week, w.id]
# for w in derriford_workers
# )
# >= 1
# )
# if self.constraint_options["ensure_derriford_reg_for_nights"]:
# self.model.night_shifts_derriford_rule = Constraint(
# [week for week in self.weeks],
# [shift.name for shift in self.get_shifts_with_constraint("night")],
# rule=nightShiftDerrifordRule,
# )
def presenceAtHomeSite(model, week, shift, required_site, required_number):
required_site_workers = [
w for w in self.workers if required_site == w.home_site
]
return (
sum(
model.shift_week_worker_assigned[shift, week, w.id]
for w in required_site_workers
)
>= required_number
)
for shift in self.get_shifts_with_constraint("require_home_site_presence"):
site, required_number = shift.constraint_options["require_home_site_presence"]
#self.model.require_presence_at_site_overnight_rule = Constraint(
setattr(self.model, f"require_home_site_presence_{shift.name}", Constraint(
[week for week in self.weeks],
[shift.name],
[site],
[required_number],
rule=presenceAtHomeSite,
))
# # Count the number of workers from each site on each night shift
# # As 1 or 0 is optimum we can simply subtract 1 from the number
#if self.constraint_options["balance_nights_across_sites"]:
# for site in self.sites:
# for shift in self.get_shifts_with_constraint("night"):
# block = shift.name
# for week in self.weeks:
# self.model.constraints.add(
# self.model.night_per_site[week, block, site]
# == sum(
# self.model.shift_week_worker_assigned[
# block, week, worker.id
# ]
# for worker in self.workers
# if worker.site == site
# )
# # 1 >= sum(self.model.shift_week_worker_assigned[shift.name, week, worker.id] for worker in self.workers if worker.site == site)
# )
# self.model.constraints.add(
# self.model.night_per_site_t1[week, block, site]
# - self.model.night_per_site_t2[week, block, site]
# == self.model.night_per_site[week, block, site] - 1
# )
for site in self.sites:
for shift in self.get_shifts_with_constraint("balance_across_groups"):
if site in shift.site:
block = shift.name
for week in self.weeks:
self.model.constraints.add(
self.model.shift_per_site[week, block, site]
== sum(
self.model.shift_week_worker_assigned[
block, week, worker.id
]
for worker in self.workers
if worker.site == site
)
# 1 >= sum(self.model.shift_week_worker_assigned[shift.name, week, worker.id] for worker in self.workers if worker.site == site)
)
self.model.constraints.add(
self.model.shift_per_site_t1[week, block, site]
- self.model.shift_per_site_t2[week, block, site]
== self.model.shift_per_site[week, block, site] - 1
)
weeks_days = self.get_week_day_combinations()
for week in self.weeks:
for shift_name in self.shifts_to_assign_or_force_as_blocks():
shift = self.get_shift_by_name(shift_name)
for worker in self.get_workers_for_shift(shift):
self.model.constraints.add(
8
* self.model.blocks_worker_shift_assigned[
worker.id, week, shift_name
]
>= sum(
self.model.works[worker.id, week, day, shift_name]
for day in shift.shift_days
)
)
self.model.constraints.add(
self.model.blocks_assigned[week, shift_name]
== sum(
self.model.blocks_worker_shift_assigned[
worker.id, week, shift_name
]
for worker in self.workers
)
)
if shift.force_as_block:
if shift.force_as_block_unless_nwd:
workers = self.get_workers_for_shift(shift)
# Get workers who have a nwd on the shift
nwd_workers = []
full_workers = []
for w in workers:
if w.nwd is not None:
l = []
# This should take into account dates!
for nwd, d1, d2 in w.nwd:
if nwd in shift.shift_days:
l.append(w)
if l:
nwd_workers.append(w)
else:
full_workers.append(w)
else:
full_workers.append(w)
if not nwd_workers: # Just do the usual
self.model.constraints.add(
sum(
self.model.blocks_worker_shift_assigned[
worker.id, week, shift.name
]
for worker in self.workers
)
<= 1
)
else:
self.model.constraints.add(
sum(
self.model.blocks_worker_shift_assigned[
worker.id, week, shift.name
]
for worker in full_workers
)
<= 1
)
self.model.constraints.add(
sum(
self.model.blocks_worker_shift_assigned[
worker.id, week, shift.name
]
for worker in workers
)
<= 2
)
# self.model.constraints.add(
# self.model.worker_block_shift_split[week, shift.name] <= 2 - sum(self.model.blocks_worker_shift_assigned[worker.id,
# week,
# shift.name]
# for worker in workers))
#
# self.model.constraints.add(
# sum(self.model.works[w.id, week, day,shift.name]
# for w in nwd_workers for day in shift.shift_days) - sum(self.model.works[w.id, week, day,shift.name]
# for w in full_workers for day in shift.shift_days) >= self.model.worker_block_shift_split[week, shift.name] )
else:
self.model.constraints.add(
sum(
self.model.blocks_worker_shift_assigned[
worker.id, week, shift.name
]
for worker in self.workers
)
<= shift.workers_required
)
# Most of our constraints apply per worker
for worker in self.workers:
if self.constraint_options["minimise_shift_diffs"]:
self.model.constraints.add(
self.model.shift_count_diff_summed[worker.id]
== sum(
self.model.shift_count_diff[worker.id, shift.name]
for shift in self.get_shifts()
)
)
for week_blocks in self.get_week_block_iterator(4):
# Prevent more than n number shifts per 4 weeks
self.model.constraints.add(
self.constraint_options["max_shifts_per_month"]
>= sum(
self.model.works[worker.id, week, day, shiftname]
for week, day, shiftname in self.get_all_shiftname_combinations()
if week in week_blocks
)
)
if self.constraint_options["avoid_st2_first_month"] and worker.grade == 2:
# Avoid ST1s on the first month
try:
self.model.constraints.add(
0
== sum(
self.model.works[worker.id, week, day, shift]
for week, day, shift in self.get_all_shiftname_combinations()
if week in (1, 2, 3, 4)
and shift in ("night_weekday", "night_weekend")
)
)
except ValueError as e:
print("Failure setting constraint", "avoid_st2_first_month")
print(e)
# Count number of weekends an worker works
#if self.constraint_options["balance_weekends"]:
self.model.constraints.add(
self.model.worker_weekend_count[worker.id]
== sum(
self.model.works_weekend[worker.id, week] for week in self.weeks
)
)
if self.constraint_options["max_weekends"] > -1:
self.model.constraints.add(
self.constraint_options["max_weekends"]
>= self.model.worker_weekend_count[worker.id]
)
# Balance shifts within required limits (set by balance_offset)
# If balance_offset is too restrictive (for the rota length)
# no solution will be possible
for shift in self.get_shifts():
if (
worker.site in shift.site
): # Each site specfies which sites self.workers can fullfill it
# calaculate the total number of shifts that need assigning over the rota
# total_shifts = (len(self.weeks) * len(shift.shift_days) *
total_shifts = self.shift_counts[shift] * shift.workers_required
full_time_equivalent_joined = sum(
self.full_time_equivalent_sites[i] for i in shift.site
)
target_shifts = (
total_shifts / full_time_equivalent_joined * worker.fte_adj
)
if self.use_previous_shifts:
if shift.name in worker.previous_shifts:
worked, allocated = worker.previous_shifts[shift.name]
target_shifts = (
target_shifts + float(allocated) - float(worked)
)
if self.use_shift_balance_extra:
if shift.name in worker.shift_balance_extra:
extra = worker.shift_balance_extra[shift.name]
target_shifts = target_shifts + extra
# print(worker.name, shift.name, target_shifts)
worker.shift_target_number[shift.name] = target_shifts
if shift.hard_constrain_shift:
adjusted_balance_offset = shift.balance_offset
if worker.fte_adj < 100:
adjusted_balance_offset = (
adjusted_balance_offset * self.ltft_balance_offset
)
max_shifts = (
target_shifts
+ adjusted_balance_offset * self.balance_offset_modifier
)
min_shifts = (
target_shifts
- adjusted_balance_offset * self.balance_offset_modifier
)
self.model.constraints.add(
inequality(
min_shifts,
sum(
self.model.works[worker.id, week, day, shift.name]
for week, day in self.get_week_day_combinations_for_shift(shift)
#for week, day in self.get_week_day_combinations()
#if shift.name in self.get_shift_names_by_week_day(week, day)
),
max_shifts,
)
)
else:
# Make sure shifts aren't assigned to those from other sites
self.model.constraints.add(
0
== sum(
self.model.works[worker.id, week, day, shift.name]
for week, day in self.get_week_day_combinations_for_shift(shift)
#for week, day in self.get_week_day_combinations()
)
)
# model.shift_count stores the number of shifts that a worker is assigned to worker by shift
# this is used (by the objective) to balance the total number of shifts worked
self.model.constraints.add(
self.model.shift_count[worker.id, shift.name]
== sum(
self.model.works[worker.id, week, day, shift.name]
for week, day in self.get_week_day_combinations_for_shift(shift)
)
)
self.model.constraints.add(
self.model.shift_count_diff[worker.id, shift.name]
== self.model.shift_count[worker.id, shift.name]
- worker.shift_target_number[shift.name]
)
if self.constraint_options["balance_shifts"]:
self.model.constraints.add(
self.model.shift_count_t1[worker.id, shift.name]
- self.model.shift_count_t2[worker.id, shift.name]
== self.model.shift_count_diff[worker.id, shift.name]
)
if self.constraint_options["balance_shifts_quadratic"]:
# This may need to be updated
xU = 25
xL = 1
self.model.constraints.add(
inequality(
xL,
self.model.shift_count_t1[worker.id, shift.name]
+ self.model.shift_count_t2[worker.id, shift.name]
+ 1,
xU,
)
)
self.model.constraints.add(
self.model.shift_count_w[worker.id, shift.name]
>= xL
* (
self.model.shift_count_t1[worker.id, shift.name]
+ self.model.shift_count_t2[worker.id, shift.name]
+ 1
)
* 2
- xL * xL
)
self.model.constraints.add(
self.model.shift_count_w[worker.id, shift.name]
>= xU
* (
self.model.shift_count_t1[worker.id, shift.name]
+ self.model.shift_count_t2[worker.id, shift.name]
+ 1
)
* 2
- xU * xU
)
# Define worker_shift_count_t1 and worker_shift_count_t2 constraints for the object
# Thus bypassing the need for a quadratic solver
# t1-t2 is the target
# As the objective is to minimise t1+t2 and t1 and t2 are positive reals
# t1+t2 approximates the absolute target (which otherwise requires a quadratic solver)
# TODO: quadratic implementation so perfect solutions will be chosen
if self.constraint_options["balance_shifts_over_workers"]:
self.model.constraints.add(
self.model.worker_shift_count_t1[worker.id]
- self.model.worker_shift_count_t2[worker.id]
== sum(
(self.model.shift_count_diff[worker.id, shift.name])
* shift.balance_weighting
for shift in self.get_shifts()
)
)
if self.constraint_options["balance_bank_holidays"]:
extra_bank_holiday = 0
if self.use_bank_holiday_extra:
extra_bank_holiday = worker.bank_holiday_extra
self.model.constraints.add(
self.model.bank_holiday_count[worker.id]
== sum(
self.model.works[worker.id, week, day, shift]
for week, day, shift in self.get_all_shiftname_combinations()
if self.week_day_date_map[(week, day)] in bank_holiday_map
)
+ extra_bank_holiday
)
xU = len(self.get_bank_holiday_week_days()) + 1
xL = 1
self.model.constraints.add(
inequality(
xL,
self.model.bank_holiday_count[worker.id] + 1,
xU,
)
)
self.model.constraints.add(
self.model.bank_holiday_count_w[worker.id]
>= xL * (self.model.bank_holiday_count[worker.id] + 1) * 2 - xL * xL
)
self.model.constraints.add(
self.model.bank_holiday_count_w[worker.id]
>= xU * (self.model.bank_holiday_count[worker.id] + 1) * 2 - xU * xU
)
if self.constraint_options["balance_nights"]:
self.model.constraints.add(
self.model.night_shift_count[worker.id]
== sum(
self.model.works[worker.id, week, day, shift.name]
for week, day in self.get_week_day_combinations()
for shift in self.get_shifts_with_constraint("night")
)
)
night_shift_target_number = sum(
worker.shift_target_number[shift.name]
for shift in self.get_shifts_with_constraint("night")
)
self.model.constraints.add(
self.model.night_shift_count_t1[worker.id]
- self.model.night_shift_count_t2[worker.id]
== self.model.night_shift_count[worker.id]
- night_shift_target_number
)
# This may need to be updated
xU = 6
xL = 1
self.model.constraints.add(
inequality(
xL,
self.model.night_shift_count_t1[worker.id]
+ self.model.night_shift_count_t2[worker.id]
+ 1,
xU,
)
)
self.model.constraints.add(
self.model.night_shift_count_w[worker.id]
>= xL
* (
self.model.night_shift_count_t1[worker.id]
+ self.model.night_shift_count_t2[worker.id]
+ 1
)
* 2
- xL * xL
)
self.model.constraints.add(
self.model.night_shift_count_w[worker.id]
>= xU
* (
self.model.night_shift_count_t1[worker.id]
+ self.model.night_shift_count_t2[worker.id]
+ 1
)
* 2
- xU * xU
)
# self.model.constraints.add(
# self.model.night_shift_count_w[worker.id] >= 0)
# We use a similar method to balance the number of weekends worked
# This works as long as weekend shifts are assigned as blocks!
weekend_shift_target_number = sum(
worker.shift_target_number[shift.name] / len(shift.shift_days)
for shift in self.get_shifts()
if "Sat" in shift.shift_days or "Sun" in shift.shift_days
)
worker.weekend_shift_target_number = weekend_shift_target_number
if self.constraint_options["balance_weekends"]:
if weekend_shift_target_number > 0:
self.model.constraints.add(
self.model.weekend_shift_count_t1[worker.id]
- self.model.weekend_shift_count_t2[worker.id]
== self.model.worker_weekend_count[worker.id]
- weekend_shift_target_number
)
xU = self.constraint_options["max_weekends"]
xL = 1
self.model.constraints.add(
inequality(
xL,
self.model.weekend_shift_count_t1[worker.id]
+ self.model.weekend_shift_count_t2[worker.id]
+ 1,
xU,
)
)
self.model.constraints.add(
self.model.weekend_shift_count_w[worker.id]
>= xL
* (
self.model.weekend_shift_count_t1[worker.id]
+ self.model.weekend_shift_count_t2[worker.id]
+ 1
)
* 2
- xL * xL
)
self.model.constraints.add(
self.model.weekend_shift_count_w[worker.id]
>= xU
* (
self.model.weekend_shift_count_t1[worker.id]
+ self.model.weekend_shift_count_t2[worker.id]
+ 1
)
* 2
- xU * xU
)
# Ensure worker is not allocated shifts on non working days
if worker.nwd:
for week, day, shift in self.get_all_shiftclass_combinations():
for n, start, end in worker.nwd:
if not shift.rota_on_nwds and day == n:
# print(start, self.week_day_date_map[(week, day)], end)
if start <= self.week_day_date_map[(week, day)] <= end:
self.model.constraints.add(
0
== self.model.works[
worker.id, week, day, shift.name
]
)
if self.constraint_options["balance_blocks"]:
for week_blocks in self.get_week_block_iterator(
self.max_night_frequency
):
if self.get_shifts_with_constraint("night"):
# Prevent nights more than once every n weeks
self.model.constraints.add(
1
>= sum(
self.model.shift_week_worker_assigned[
shift.name, week, worker.id
]
for week in week_blocks
for shift in self.get_shifts_with_constraint("night")
)
)
#if self.constraint_options["balance_weekends"]:
for week_blocks in self.get_week_block_iterator(
self.max_weekend_frequency
):
# Prevent weekend shifts more than once every n weeks
self.model.constraints.add(
1
>= sum(
self.model.works_weekend[worker.id, week]
for week in week_blocks
)
)
for week in self.weeks:
self.model.constraints.add(
self.constraint_options["max_shifts_per_week"]
>= sum(
self.model.works[worker.id, week, day, shiftname]
#for shiftname in self.get_shift_names_by_week_day(week, day)
#for day in self.days
for day, shiftname in self.get_day_shiftname_combinations()
)
)
# TODO: generic implementation
#for shift in self.get_shifts_with_constraint("max_2_shifts_per_week"):
# self.model.constraints.add(
# 2
# >= sum(
# self.model.works[worker.id, week, day, shift.name]
# for day in self.days
# )
# )
if (
worker.site
in self.constraint_options["prevent_monday_after_full_weekends"]
):
# Ignore last week
if week + 1 in self.weeks:
self.model.constraints.add(
full_weekend_count
>= sum(
self.model.works[worker.id, week, "Sat", shift.name]
for shift in self.get_shifts()
)
+ sum(
self.model.works[worker.id, week, "Sun", shift.name]
for shift in self.get_shifts()
)
+ sum(
self.model.works[worker.id, week + 1, "Mon", shift.name]
for shift in self.get_shifts()
)
)
if (
worker.site
in self.constraint_options[
"prevent_monday_and_tuesday_after_full_weekends"
]
):
# Ignore last week
if week + 1 in self.weeks:
self.model.constraints.add(
full_weekend_count
>= sum(
self.model.works[worker.id, week, "Sat", shift.name]
for shift in self.get_shifts()
)
+ sum(
self.model.works[worker.id, week, "Sun", shift.name]
for shift in self.get_shifts()
)
+ sum(
self.model.works[worker.id, week + 1, "Mon", shift.name]
for shift in self.get_shifts()
)
+ sum(
self.model.works[worker.id, week + 1, "Tue", shift.name]
for shift in self.get_shifts()
)
)
if (
worker.site
in self.constraint_options["prevent_fridays_before_full_weekends"]
):
self.model.constraints.add(
full_weekend_count
>= sum(
self.model.works[worker.id, week, "Sat", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
+ sum(
self.model.works[worker.id, week, "Sun", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
+ sum(
self.model.works[worker.id, week, "Fri", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
)
if (
worker.site
in self.constraint_options["prevent_thursdays_before_full_weekends"]
):
self.model.constraints.add(
full_weekend_count
>= sum(
self.model.works[worker.id, week, "Sat", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
+ sum(
self.model.works[worker.id, week, "Sun", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
+ sum(
self.model.works[worker.id, week, "Thu", shift.name]
for shift in self.get_shifts()
if "night" not in shift.constraints
)
)
# # model.weekend_count stores the number of weekend shifts that a worker is assigned to wor
# # this is used (by the objective) to balance the total number of weekend shifts worked
# self.model.constraints.add(
# # We could use a helper to get required shifts to check
# self.model.works_whole_weekend[worker.id, week] >= sum(
# self.model.works[worker.id, week, day, shift.name]
# for day in self.days[5:]
# for shift in self.get_shifts()) - 1)
# self.model.constraints.add(
# self.model.works_whole_weekend[worker.id, week] <= sum(
# self.model.works[worker.id, week, day, shift.name]
# for day in self.days[5:]
# for shift in self.get_shifts()) / 2)
#if self.constraint_options["balance_weekends"]:
self.model.constraints.add(
self.model.works_weekend[worker.id, week]
>= sum(
self.model.works[worker.id, week, day, shiftname]
for day, shiftname in self.get_day_shiftname_combinations() if day in self.days[5:]
#for day in self.days[5:]
#for shift in self.get_shifts()
)
/ 2
)
self.model.constraints.add(
self.model.works_weekend[worker.id, week]
<= sum(
self.model.works[worker.id, week, day, shiftname]
for day, shiftname in self.get_day_shiftname_combinations() if day in self.days[5:]
#for day in self.days[5:]
#for shift in self.get_shifts()
)
)
# self.model.constraints.add(
# self.model.works_saturday[worker.id, week] == sum(
# self.model.works[worker.id, week, "Sat", shift.name]
# for shift in self.get_shifts()))
# self.model.constraints.add(
# self.model.works_sunday[worker.id, week] == sum(
# self.model.works[worker.id, week, "Sun", shift.name]
# for shift in self.get_shifts()))
# self.model.constraints.add(1 == sum(
# self.model.shift_week_worker_assigned[s.name, week, worker.id]
# for s in self.get_shifts_with_constraint("night")))
#for shift in self.get_shifts_with_constraint("night"):
for shift in self.get_shifts():
if shift.force_as_block:
# Force nights to be assigned in blocks
# self.model.constraints.add(8* self.model.shift_week_worker_assigned[shift.name, week, worker.id] >= sum(self.model.works[worker.id, week, day, shift.name] for day in self.days)
# )
# Force night shifts to be assigned in blocks
self.model.constraints.add(
self.model.shift_week_worker_assigned[
shift.name, week, worker.id
]
* len(shift.shift_days)
== sum(
self.model.works[worker.id, week, day, shift.name]
for day in shift.shift_days
)
)
#
for n in range(len(weeks_days)):
week, day = weeks_days[n]
p1 = 1
p2 = 1
if n > 0:
pweek, pday = weeks_days[n - 1]
else:
p1 = 0
pweek, pday = weeks_days[n]
try:
p2week, p2day = weeks_days[n - 2]
except IndexError:
p2week, p2day = weeks_days[n]
p2 = 0
n1 = 1
n2 = 1
try:
nweek, nday = weeks_days[n + 1]
except IndexError:
nweek, nday = weeks_days[n]
n1 = 0
try:
n2week, n2day = weeks_days[n + 2]
except IndexError:
n2week, n2day = weeks_days[n]
n2 = 0
try:
n3week, n3day = weeks_days[n + 3]
except IndexError:
n3week, n3day = weeks_days[n]
n3 = 0
# IF paired we check the following against both workers
workers = [worker]
if self.constraint_options["hard_constrain_pair_separation"]:
for worker_pairs in self.worker_pairs:
if worker_pairs[0] == worker:
workers = worker_pairs
if self.get_shift_names_by_week_day(week, day):
# Unable to work (hard constraint not preference)
self.model.constraints.add(
self.model.available[worker.id, week, day]
>= sum(
self.model.works[worker.id, week, day, shift]
for shift in self.get_shift_names_by_week_day(week, day)
)
)
# single shift per day
self.model.constraints.add(
1
>= sum(
self.model.works[worker.id, week, day, shift]
for shift in self.get_shift_names_by_week_day(week, day)
)
)
if self.constraint_options["hard_constrain_pair_separation"]:
for worker_pairs in self.worker_pairs:
if worker_pairs[0] == worker:
self.model.constraints.add(
1
>= sum(
self.model.works[w.id, week, day, shift]
for shift in self.get_shift_names_by_week_day(
week, day
)
for w in worker_pairs
)
)
for constraint_shift in self.get_shifts_with_constraints(
"preclear", "preclear2"
):
if day in constraint_shift.shift_days:
self.model.constraints.add(
1
>= self.model.works[worker.id, week, day, constraint_shift.name]
+ sum(
p1 * self.model.works[w.id, pweek, pday, shiftname]
for shiftname in self.get_shift_names_by_week_day(pweek, pday)
#for day, shiftname in self.get_day_shiftname_combinations() if day == pday
if shiftname != constraint_shift.name
for w in workers
)
)
for constraint_shift in self.get_shifts_with_constraint("preclear2"):
if day in constraint_shift.shift_days:
self.model.constraints.add(
1
>= self.model.works[worker.id, week, day, constraint_shift.name]
+ sum(
p2 * self.model.works[w.id, p2week, p2day, shiftname]
for shiftname in self.get_shift_names_by_week_day(p2week, p2day)
if shiftname != constraint_shift.name
for w in workers
)
)
for constraint_shift in self.get_shifts_with_constraints(
"postclear", "postclear2"
):
if day in constraint_shift.shift_days:
self.model.constraints.add(
1
>= self.model.works[worker.id, week, day, constraint_shift.name]
+ sum(
n1 * self.model.works[w.id, nweek, nday, shiftname]
for shiftname in self.get_shift_names_by_week_day(nweek, nday)
if shiftname != constraint_shift.name
for w in workers
)
)
for constraint_shift in self.get_shifts_with_constraints("postclear2"):
if day in constraint_shift.shift_days:
self.model.constraints.add(
1
>= self.model.works[worker.id, week, day, constraint_shift.name]
+ sum(
n2 * self.model.works[w.id, n2week, n2day, shiftname]
for shiftname in self.get_shift_names_by_week_day(n2week, n2day)
if shiftname != constraint_shift.name
for w in workers
)
)
# NOTE: use pre / post clear instead
# if working a night ensure preceeding (1) or subsequent (2) shifts can only be nights
if self.constraint_options["constrain_time_off_after_nights"]:
for constraint_shift in self.get_shifts_with_constraint("night"):
if day in constraint_shift.shift_days:
# Ensure night prior to unavalibity is not assigned
self.model.constraints.add(
self.model.available[worker.id, week, day]
>= self.model.works[
worker.id, pweek, pday, constraint_shift.name
]
)
# print("Workers", workers)
self.model.constraints.add(
1
>= self.model.works[
worker.id, week, day, constraint_shift.name
]
+ sum(
n1 * self.model.works[w.id, nweek, nday, shift]
for shift in self.get_shift_names_by_week_day(
nweek, nday
)
if shift != constraint_shift.name
for w in workers
)
)
self.model.constraints.add(
1
>= self.model.works[
worker.id, week, day, constraint_shift.name
]
+ sum(
n2 * self.model.works[w.id, n2week, n2day, shift]
for shift in self.get_shift_names_by_week_day(
n2week, n2day
)
if shift != constraint_shift.name
for w in workers
)
)
# self.model.constraints.add(
# 1 >= self.model.works[worker.id, week, day,
# constraint_shift.name] +
# sum(n3 * self.model.works[worker.id, n3week, n3day,
# shift]
# for shift in self.get_shift_names_by_week_day(week, n3day)
# if shift != constraint_shift.name))
self.model.constraints.add(
1
>= self.model.works[
worker.id, week, day, constraint_shift.name
]
+ sum(
p1 * self.model.works[w.id, pweek, pday, shift]
for shift in self.get_shift_names_by_week_day(
pweek, pday
)
if shift != constraint_shift.name
for w in workers
)
)
self.model.constraints.add(
1
>= self.model.works[
worker.id, week, day, constraint_shift.name
]
+ sum(
p2 * self.model.works[w.id, p2week, p2day, shift]
for shift in self.get_shift_names_by_week_day(
p2week, p2day
)
if shift != constraint_shift.name
for w in workers
)
)
self.define_objectives()
def define_objectives(self):
# Define an objective function with model as input, to pass later
def obj_rule(m):
# c = len(workers)
balance_modifier_constant = 1
if self.constraint_options["balance_shifts_over_workers"]:
worker_shift_balancing = sum(
balance_modifier_constant
* (
self.model.worker_shift_count_t1[(worker.id)]
+ self.model.worker_shift_count_t2[(worker.id)]
)
for worker in self.workers
)
else:
worker_shift_balancing = 0
if self.constraint_options["balance_shifts"]:
shift_balancing = sum(
balance_modifier_constant
* (
self.model.shift_count_t1[worker.id, shift.name]
+ self.model.shift_count_t2[worker.id, shift.name]
)
for worker in self.workers
for shift in self.get_shifts()
)
else:
shift_balancing = 0
if self.constraint_options["balance_shifts_quadratic"]:
shift_balancing = sum(
balance_modifier_constant
* (
self.model.shift_count_t1[worker.id, shift.name]
+ self.model.shift_count_t2[worker.id, shift.name]
)
for worker in self.workers
for shift in self.get_shifts()
)
else:
shift_balancing = 0
if self.constraint_options["minimise_shift_diffs"]:
shift_diff_modifier_constant = 10
shift_diff_balancing = sum(
shift_diff_modifier_constant
* self.model.shift_count_diff_summed[(worker.id)]
for worker in self.workers
)
else:
shift_diff_balancing = 0
if self.constraint_options["balance_nights"]:
night_balance_modifier_constant = 10
night_shift_balancing = sum(
night_balance_modifier_constant
* self.model.night_shift_count_w[(worker.id)]
# (self.model.night_shift_count_t1[(worker.id)] +
# self.model.night_shift_count_t2[(worker.id)])
for worker in self.workers
)
else:
night_shift_balancing = 0
if self.constraint_options["balance_bank_holidays"]:
bank_holiday_balance_modifier_constant = 1000
bank_holiday_balancing = sum(
bank_holiday_balance_modifier_constant
* (self.model.bank_holiday_count_w[(worker.id)] - 1)
# (self.model.night_shift_count_t1[(worker.id)] +
# self.model.night_shift_count_t2[(worker.id)])
for worker in self.workers
)
else:
bank_holiday_balancing = 0
if self.constraint_options["balance_weekends"]:
weekend_balance_modifier_constant = 5
weekend_shift_balancing = sum(
weekend_balance_modifier_constant
* self.model.weekend_shift_count_w[(worker.id)]
for worker in self.workers
)
else:
weekend_shift_balancing = 0
preference_constant = 10
# Preferences (not to work)
preferences = sum(
self.model.pref_not_to_work[worker.id, week, day]
* self.model.works[worker.id, week, day, shift]
* preference_constant
for worker in self.workers
for week, day, shift in self.get_all_shiftname_combinations()
)
# Work requsets
work_request_constant = 10000 # Needs to be very big to override loss from bank holiday requests
work_requests = sum(
self.model.work_requests[worker.id, week, day, shift]
* self.model.works[worker.id, week, day, shift]
* work_request_constant
for worker in self.workers
for week, day, shift in self.get_all_shiftname_combinations()
)
# # Spread nights
if self.constraint_options["balance_nights_across_sites"]:
nights_site_balancing = sum(
(
self.model.night_per_site_t1[week, shift.name, site]
+ self.model.night_per_site_t2[week, shift.name, site]
)
* 20
# self.model.night_per_site2[week, block, site]
for week in self.weeks
for shift in self.get_shifts_with_constraint("night")
for site in self.sites
)
else:
nights_site_balancing = 0
if self.get_shifts_with_constraint("balance_across_groups"):
block_site_balancing = sum(
(
self.model.shift_per_site_t1[week, shift.name, site]
+ self.model.shift_per_site_t2[week, shift.name, site]
)
* 2000
# self.model.night_per_site2[week, block, site]
for week in self.weeks
for shift in self.get_shifts_with_constraint("balance_across_groups")
for site in self.sites
)
else:
block_site_balancing = 0
if self.constraint_options["balance_blocks"]:
blocks_balancing = sum(
1 * self.model.blocks_assigned[week, shift]
for week in self.weeks
for shift in self.shifts_to_assign_as_blocks()
)
else:
blocks_balancing = 0
# Quadratic :(
# worker_pairs_balancing = 0
# worker_pairs_constant = 100000
# if self.worker_pairs:
# for worker_a, worker_b in self.worker_pairs:
# print(worker_a, worker_b)
# for week, day in self.get_week_day_combinations():
# worker_pairs_balancing = worker_pairs_balancing + sum(self.model.works[worker_a.id, week, day, shift] for shift in self.get_shift_names_by_week_day(week, day)) * sum(self.model.works[worker_b.id, week, day, shift] for shift in self.get_shift_names_by_week_day(week, day)) * worker_pairs_constant
return (
weekend_shift_balancing
+ shift_balancing
+ worker_shift_balancing
+ night_shift_balancing
+ shift_diff_balancing
+ preferences
+ nights_site_balancing
+ block_site_balancing
+ bank_holiday_balancing
+ blocks_balancing
- work_requests
)
# add objective function to the model. rule (pass function) or expr (pass expression directly)
self.model.obj = Objective(rule=obj_rule, sense=minimize)
def add_worker(self, worker: Worker) -> None:
"""Add a worker to the rota
Args:
worker (Worker):
"""
self.workers.append(worker)
def add_workers(self, workers: List) -> None:
"""Add multiple worker to the rota
Args:
workers (List(Worker)):
"""
self.workers.extend(workers)
def build_workers(self) -> None:
"""Process loaded shifts and workers
Must be called prior to attempting to solve
"""
# self.build_shifts()
if not self.workers:
raise NoWorkers("Workers must be added prior to calling build_workers")
self.workers = sorted(self.workers)
self.full_time_equivalent = sum(w.fte_adj for w in self.workers)
self.full_time_equivalent_sites = {}
self.workers_at_sites = {}
for site in self.sites:
self.workers_at_sites[site] = [w for w in self.workers if w.site == site]
self.full_time_equivalent_sites[site] = sum(
w.fte_adj for w in self.workers if w.site == site
)
pairs = defaultdict(list)
for w in self.workers:
if w.pair > 0:
pairs[w.pair].append(w)
for p in pairs:
self.worker_pairs.append(tuple(pairs[p]))
def add_shift(self, shift) -> None:
"""Add a shift to the collection
:param SingleShift shift: Shift object
"""
self.shifts.append(shift)
def add_shifts(self, *shifts: SingleShift) -> None:
"""Add multiple shifts
Returns:
None
"""
self.shifts.extend(shifts)
def get_shift_names_by_week_day(self, week, day: DayStr) -> set():
"""Returns the shifts required for a specific day
Returns:
set: Set of ShiftName
"""
return self.week_day_shifts_dict[(week, day)]
def get_shift_by_name(self, name):
"""
:param name:
"""
return self.shifts_by_name[name]
def get_shift_length_by_name(self, name):
"""Get the length of a shift
Args:
name (str): Name of a shift
Returns:
int: Length of the shift
"""
return self.shifts_by_name[name].length
def build_shifts(self):
"""
Process the added shifts
"""
self.shifts_by_name = {}
self.shift_names = [] # type: List[ShiftName]
# self.week_day_shifts_dict = {(week, day): set() for week in self.weeks for day in days}
self.week_day_shifts_dict = {}
self.sites = set()
self.week_day_shift_product = []
self.week_day_shiftclass_product = []
self.shift_counts = defaultdict(int)
for week, day in self.weeks_days_product:
self.week_day_shifts_dict[(week, day)] = set()
for s in self.shifts:
if s.bank_holidays_only:
if self.week_day_date_map[(week, day)] in bank_holiday_map:
self.week_day_shift_product.append((week, day, s.name))
self.week_day_shiftclass_product.append((week, day, s))
self.week_day_shifts_dict[(week, day)].add(s.name)
self.shift_counts[s] = self.shift_counts[s] + 1
else:
if day in s.shift_days:
self.week_day_shift_product.append((week, day, s.name))
self.week_day_shiftclass_product.append((week, day, s))
self.week_day_shifts_dict[(week, day)].add(s.name)
self.shift_counts[s] = self.shift_counts[s] + 1
# print(self.week_day_shift_product)
for s in self.shifts:
self.shifts_by_name[s.name] = s
self.shift_names.append(s.name)
# for day in s.shift_days:
# self.week_day_shifts_dict[(week, day)].add(s.name)
for site in s.site:
self.sites.add(site)
# Todo replace with week_day.....
self.day_shift_product = []
self.day_shiftclass_product = []
for s in self.shifts:
for day in days:
if day in s.shift_days:
self.day_shift_product.append((day, s.name))
self.day_shiftclass_product.append((day, s))
def get_day_shiftname_combinations(self):
"""Returns a list of all required day / shift combinations
Returns:
list: list of in the following format (str->day, str->shift)
"""
return self.day_shift_product
def get_day_shiftclass_combinations(self) -> List[Tuple[DayStr, SingleShift]]:
"""Returns a list of all required day / shift combinations
Returns:
list: list of in the following format (str->day, shiftObject->shift)
"""
return self.day_shiftclass_product
def get_all_shiftname_combinations(self) -> List[Tuple[WeekInt, DayStr, ShiftName]]:
"""Returns a list of all possible week / day / shift combinations
Returns:
list: contains tuple of all possible week / day / shift combinations
"""
return self.week_day_shift_product
def get_all_shiftclass_combinations(
self,
) -> List[Tuple[WeekInt, DayStr, SingleShift]]:
"""Returns a list of all possible week / day / shift combinations
Returns:
list: contains tuple of all possible week / day / shift combinations
"""
return self.week_day_shiftclass_product
def get_week_day_combinations(self) -> list:
"""Returns a list of all week / day tuple combinations
Returns:
list: list of possible week day combinations
[(1, "Mon"), (1, "Tue"), ... (n, "Fri")]
"""
return self.weeks_days_product
def get_week_day_combinations_for_shift(self, shift) -> list:
return [(week, day) for week, day in self.get_week_day_combinations() if shift.name in self.get_shift_names_by_week_day(week, day)]
def get_shifts(self) -> List[SingleShift]:
"""Returns a list of all the registered shifts
Returns:
List[SingleShift]: list of registered shifts (as SingleShift)
"""
return self.shifts
def get_shifts_with_constraint(self, constraint) -> List[SingleShift]:
return [shift for shift in self.shifts if constraint in shift.constraints]
def get_shifts_with_constraints(self, *constraints) -> set[SingleShift]:
shifts = set()
for constraint in constraints:
shifts.update(
[shift for shift in self.shifts if constraint in shift.constraints]
)
return shifts
def get_shift_names(self) -> List[ShiftName]:
"""Returns a list of all the registered shift names
Returns:
List[ShiftName]: List of names of all available shifts
""" """ """
return self.shift_names
def get_week_block_iterator(self, block_length):
"""Gets a two dimensional list of week blocks in specified length
e.g. block_length = 4
[
[ 1, 2, 3, 4],
[ 2, 3, 4, 5],
...
]
Args:
block_length (int): length of blocks to create
Returns:
list: two dimensional list containing weeks in blocks
"""
blocks = []
for i in range(len(self.weeks) - block_length + 1):
block = self.weeks[i : i + block_length]
blocks.append(block)
return blocks
def get_required_workers_and_site_combinations(self):
"""Returns a list of all possible shifts, the workers required and site
Returns:
list: list (week, day, shift name, workers required, shift site)
"""
l = []
for week, day, shift in self.week_day_shiftclass_product:
# if day in shift.shift_days:
l.append((week, day, shift.name, shift.workers_required, shift.site))
return l
def get_not_required_shifts(self):
"""Returns a set of all possible shifts combinations that are not required
Includes those on days
Returns:
list: (week, day, shift)
"""
l = set()
for week in self.weeks:
for day in days:
for shift in self.shifts:
l.add((week, day, shift))
return l - set(self.get_all_shiftclass_combinations())
def shifts_to_assign_as_blocks(self):
return [shift.name for shift in self.get_shifts() if shift.assign_as_block]
def shifts_to_force_as_blocks(self):
return [shift.name for shift in self.get_shifts() if shift.force_as_block]
def shifts_to_assign_or_force_as_blocks(self):
s = self.shifts_to_assign_as_blocks()
s.extend(self.shifts_to_force_as_blocks())
return s
def get_workers_by_group(self) -> Dict[str, Worker]:
group_workers = defaultdict(set)
for worker in self.workers:
group_workers[worker.site].add(worker)
return group_workers
def get_workers_by_grade(self) -> Dict[str, Worker]:
group_workers = defaultdict(set)
for worker in self.workers:
group_workers[worker.grade].add(worker)
return group_workers
def get_workers_for_shift(self, shift: SingleShift) -> List[Worker]:
return [worker for worker in self.workers if worker.site in shift.site]
def get_workers_total_fte(self) -> float:
return self.full_time_equivalent
def get_worker_details(self):
w = defaultdict(list)
for worker in self.workers:
# print(worker)
w[worker.site].append(worker)
l = []
for site in w:
l.append(f"{site}: {sum(worker.fte_adj for worker in w[site]) / 100}")
t = "\n".join(l)
return f"Full time equivalent trainees by site:\n{t}"
def get_workers(self):
return self.workers
def get_bank_holiday_week_days(self):
return [
(week, day)
for week, day in self.get_week_day_combinations()
if self.week_day_date_map[(week, day)] in bank_holiday_map
]
# RESULTS
def export_rota_to_html(self, filename: str = "rota"):
with open(f"{filename}.html", "w") as f:
f.write(self.get_worker_timetable_html(True))
def export_rota_to_csv(self, filename: str = "rota"):
works = self.model.works
with open(f"{filename}.csv", "w", newline="") as f:
wr = csv.writer(f, quoting=csv.QUOTE_ALL)
l = ["Name"]
l.extend([worker.name for worker in self.workers])
wr.writerow(l)
l2 = ["Site"]
l2.extend([worker.site for worker in self.workers])
wr.writerow(l2)
l3 = ["Grade"]
l3.extend([worker.grade for worker in self.workers])
wr.writerow(l3)
l4 = ["FTE"]
l4.extend([worker.fte for worker in self.workers])
wr.writerow(l4)
for week, day in self.get_week_day_combinations():
d = [f"Week {week} Day {day}"]
for worker in self.workers:
i = ""
for shift in self.get_shift_names_by_week_day(week, day):
if works[worker.id, week, day, shift].value == 1:
i = shift
d.append(i)
wr.writerow(d)
def get_work_table(self):
"""Build a timetable of the week as a dictionary from the model's optimal solution."""
works = self.model.works
week_table = {
week: {day: {shift: [] for shift in self.get_shift_names()} for day in days}
for week in self.weeks
}
for week in self.weeks:
for worker in self.workers:
for day, shift in self.get_day_shiftname_combinations():
if works[worker.id, week, day, shift].value == 1:
week_table[week][day][shift].append(worker.get_details())
return week_table
def get_worker_timetable(self):
works = self.model.works
timetable = {
worker.name: {week: {day: "" for day in days} for week in self.weeks}
for worker in self.workers
}
for worker in self.workers:
for week in self.weeks:
for day, shift in self.get_day_shiftname_combinations():
if works[worker.id, week, day, shift].value == 1:
timetable[worker.name][week][day] = shift
return timetable
def get_worker_timetable_brief(
self, show_prefs=False, marker_every=30, show_unavailable=False
):
model = self.model
week_string = f"{'-Week-':20}" + "".join(
[7 * str(f"{w}")[-1:] for w in self.weeks]
)
days_string = f"{'-Day-':20}" + "".join("MTWTFSS" * len(self.weeks))
timetable = []
for worker in self.workers:
shifts = []
w = [f"{worker.name:20}"]
for week, day in self.get_week_day_combinations():
a = "-"
for shift in self.get_shift_names_by_week_day(week, day):
if model.works[worker.id, week, day, shift].value > 0:
shifts.append(shift)
a = shift[0]
w.append(a)
shift_count = ""
for s in set(shifts):
shift_count = shift_count + f"{s}: {shifts.count(s)}, "
shift_count = (
shift_count
+ f"#weekends_worked: {model.worker_weekend_count[worker.id].value}\\#"
)
timetable.append(f"{''.join(w)} {shift_count}")
if show_prefs:
# prefs
w = [f"{'Preferences':20}"]
for week, day in self.get_week_day_combinations():
if model.pref_not_to_work[worker.id, week, day] > 0:
w.append("Y")
else:
w.append("N")
timetable.append("".join(w))
if show_unavailable:
# prefs
w = [f"{'Unavailable':20}"]
for week, day in self.get_week_day_combinations():
if model.available[worker.id, week, day] > 0:
w.append("A")
else:
w.append("U")
timetable.append("".join(w))
i = marker_every
while i < len(timetable):
timetable.insert(i, week_string)
timetable.insert(i + 1, days_string)
i = i + marker_every + 2
timetable.append(week_string)
timetable.insert(0, week_string)
timetable.insert(0, days_string)
return "\n".join(timetable)
def get_worker_timetable_html(
self, include_html_tag=False, table_name="rota-table"
):
model = self.model
timetable = []
timetable.append(
f"<h2>Rota start date: {self.start_date.isoformat()} ({self.weeks[-1]} weeks)</h2>"
)
date_row = ["<th class='worker'></th>"]
n = 0
for week, day in self.get_week_day_combinations():
d = self.start_date + datetime.timedelta(n)
date_row.append(f"<th title='{d}'>Week {week}: {day}</th>")
n = n + 1
timetable.append(f"<tr class='data-row'>{''.join(date_row)}</tr>")
current_site = ""
for worker in self.workers:
if worker.site != current_site:
try:
timetable.append(
f"<tr><th class='site-title'>{worker.site} n={len(self.workers_at_sites[worker.site])} fte={self.full_time_equivalent_sites[worker.site]}</th><tr>"
)
except KeyError as e:
print(e)
current_site = worker.site
shifts = []
if worker.nwd is not None:
# TODO: limit to dates
nwds = ", ".join([i[0] for i in worker.nwd])
else:
nwds = None
worker_targets = json.dumps(worker.shift_target_number)
tds = []
n = 0
shift_tds = []
for week, day in self.get_week_day_combinations():
d = self.start_date + datetime.timedelta(n)
n = n + 1
a = "-"
shift_name = ""
for shift in self.get_shift_names_by_week_day(week, day):
if model.works[worker.id, week, day, shift].value > 0:
shifts.append(shift)
a = shift[0]
shift_name = shift
break
# If we haven't run just add the shift
title = f"{shift_name} ({d})"
css_class = day
unavailable_reason = ""
if model.available[worker.id, week, day] > 0:
available = True
else:
available = False
css_class = "unavailable"
try:
unavailable_reason = self.unavailable_to_work_reason[
(worker.id, week, day)
]
except KeyError:
print("Error getting reason")
print(worker.id, worker.name)
print(f"Week {week}, Day {day}")
unavailable_reason = "????"
title = f"{title} / {unavailable_reason}"
bank_holiday = ""
if d in bank_holiday_map:
css_class = " ".join((css_class, "bank-holiday"))
bank_holiday = f" data-bank-holiday='{bank_holiday_map[d]}'"
requests = ""
if (worker.id, week, day) in self.work_requests_map:
css_class = " ".join((css_class, "shift-requested"))
title = " ".join((title, "[REQUESTED]"))
requests = f" data-shift-request='{self.work_requests_map[worker.id, week, day]}'"
shift_tds.append(
f"<td title='{title}' class='rota-day {css_class}' data-shift='{shift_name}' data-available='{available}' data-unavailable_reason='{unavailable_reason}' data-date='{d}' data-week='{week}' data-day='{day}'{requests}{bank_holiday}>{a}</td>"
)
shift_count = ""
shift_count_dict = {}
for s in set(shifts):
c = shifts.count(s)
shift_count_dict[s] = c
shift_count = shift_count + f"{s}: {c}, "
shift_diff_dict = {}
for shift in self.get_shifts():
diff = model.shift_count_diff[worker.id, shift.name].value
shift_diff_dict[shift.name] = diff
worker_td = """<td title='Site: {site}' class='worker {site}'
data-nwds='{nwds}' data-site='{site}' data-worker='{name}'
data-fte='{fte}' data-fte_adj='{fte_adj}' data-end_date='{end_date}'
data-worker-targets='{targets}' data-shift-counts='{worker_shift_counts}'
data-weekend-target='{weekend_target}'
data-night-at-derriford='{nights_at_derriford}'
data-pair='{pair}'
data-shift-balance-extra='{shift_balance_extra}'
data-bank-holiday-extra='{bank_holiday_extra}'
data-shift-diff='{shift_diff}'
data-shift-diff_summed='{shift_diff_summed}'
>
<span class='name' title='{name}'>{name}</span> ({grade}) [{fte}]</td>""".format(
site=worker.site,
nwds=nwds,
name=worker.name,
fte=worker.fte,
fte_adj=worker.fte_adj,
end_date=worker.end_date,
targets=worker_targets,
worker_shift_counts=json.dumps(shift_count_dict),
weekend_target=worker.weekend_shift_target_number,
nights_at_derriford=worker.night_at_derriford,
grade=worker.grade,
pair=worker.pair,
shift_balance_extra=json.dumps(worker.shift_balance_extra),
shift_diff=json.dumps(shift_diff_dict),
shift_diff_summed=model.shift_count_diff_summed[worker.id].value,
bank_holiday_extra=worker.bank_holiday_extra,
)
shift_count = (
shift_count
+ f"#weekends_worked: {model.worker_weekend_count[worker.id].value}\\#"
)
if self.constraint_options["balance_bank_holidays"]:
bank_holiday_count = model.bank_holiday_count[worker.id].value
bank_holiday_count_w = model.bank_holiday_count_w[worker.id].value - 1
else:
bank_holiday_count = -1
bank_holiday_count_w = -1
# print(worker.name, bank_holiday_count, bank_holiday_count_w)
timetable.append(
f"<tr class='worker-row'>{worker_td}{''.join(shift_tds)}</tr>"
)
# timetable.append("<tr>{}</tr>".format("".join(w), shift_count))
# if show_prefs:
# # prefs
# w = ["{:20}".format("Preferences")]
# for week, day in self.get_week_day_combinations():
# if model.pref_not_to_work[worker.id, week, day] > 0:
# w.append("Y")
# else:
# w.append("N")
# timetable.append("".join(w))
# if show_unavailable:
# # prefs
# w = ["{:20}".format("Unavailable")]
# for week, day in self.get_week_day_combinations():
# if model.available[worker.id, week, day] > 0:
# w.append("A")
# else:
# w.append("U")
# timetable.append("".join(w))
result_stream = StringIO()
if self.results is not None:
self.results.write(ostream=result_stream)
self.results.write_json(ostream=result_stream)
result_string = result_stream.getvalue()
else:
result_string = "Rota not run"
joined_timetable = "\n".join(timetable)
html = f"""
<body>
<div class="table-div" id="{table_name}">
<table>{joined_timetable}</table>
</div>
<details>
<summary><h2>Rota settings</h2></summary>
<div>
<pre>
{json.dumps(self.constraint_options, indent=4)}
</pre>
</details>
</div>
<details>
<summary><h2>Shifts settings</h2></summary>
<div id="shifts-container" data-shifts='{json.dumps([i.name for i in self.shifts])}'>
{"<br/>".join(str(i) for i in self.shifts)}
</div>
</details>
<details>
<summary><h2>Output</h2></summary>
<pre>
{result_string}
</pre>
<div>
</body>
"""
if include_html_tag:
html = f"""<html>
<head>
<link rel="stylesheet" type="text/css" href="timetable.css">
<link rel="stylesheet" type="text/css" href="https://code.jquery.com/ui/1.13.0/themes/base/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.13.0/jquery-ui.min.js"></script>
<script src="timetable.js" defer></script>
</head>
{html}</html>"""
return html
def get_shift_summary_dict(self):
""""""
timetable = {
worker.name: {shift: "" for shift in self.get_shift_names()}
for worker in self.workers
}
for worker in self.workers:
for shift in self.get_shift_names():
timetable[worker.name][shift] = self.model.shift_count[
worker.id, shift
].value
return timetable
def get_worker_shift_list(self, worker: Worker) -> List:
shifts = []
for week, day in self.get_week_day_combinations():
# d = self.start_date + datetime.timedelta(n)
# n = n + 1
temp = ""
for shift in self.get_shift_names_by_week_day(week, day):
if self.model.works[worker.id, week, day, shift].value > 0:
temp = shift
shifts.append(temp)
return shifts
def get_shift_summary(self):
works = self.model.works
timetable = {
worker.get_details(): {shift: "" for shift in self.get_shift_names()}
for worker in self.workers
}
# timetable = { worker.get_details() : { shift : "" for shift in ["truro_twilight"] } for worker in workers }
t = []
for worker in self.workers:
l = []
total_shifts = 0
for shift in self.get_shift_names():
# for shift in ["truro_twilight"]:
c = [
works[worker.id, week, day, shift].value
for week in self.weeks
for day in days
].count(1)
if c > 0:
l.append(f"{shift} ({c})")
total_shifts = total_shifts + c
# print(worker.id, shift)
timetable[worker.get_details()][shift] = c
t.append(f"{worker.get_full_details()} [{total_shifts}]: {', '.join(l)}")
return "\n".join(t)
def get_shift_summary_html(self):
works = self.model.works
timetable = {
worker.get_details(): {shift[0]: "" for shift in self.get_shift_names()}
for worker in self.workers
}
# timetable = { worker.get_details() : { shift : "" for shift in ["truro_twilight"] } for worker in workers }
t = []
for worker in self.workers:
l = []
total_shifts = 0
for shift in self.get_shift_names():
# for shift in ["truro_twilight"]:
c = [
works[worker.id, week, day, shift]
for week in self.weeks
for day in days
].count(1)
if c > 0:
l.append(f"{shift} ({c})")
total_shifts = total_shifts + c
# print(worker.id, shift)
timetable[worker.get_details()][shift[0]] = c
t.append(f"{worker.get_full_details()} [{total_shifts}]: {', '.join(l)}")
return "\n".join(t)
class NoActiveSites(Exception):
"""Raised when there are no active sites"""
pass
class NoWorkers(Exception):
"""Raised when there are no active sites"""
pass
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