EU law requires at least 11 hours of rest between shifts. How can I ensure compliance?

import sc3
import datetime
import ctypes
import os
import csv
import win32gui, win32con
import pywin.dialogs.list

def get_open_file_name(title):
    filter='csv\0*.csv\0'
    customfilter='Other file types\0*.*\0'
    fname, customfilter, flags=win32gui.GetOpenFileNameW(
    InitialDir=project_file_path, 
    Flags=win32con.OFN_ALLOWMULTISELECT|win32con.OFN_EXPLORER,
    File='', DefExt='csv',
    Title=title,#
    Filter=filter,
    CustomFilter=customfilter,
    FilterIndex=0)
    return str(fname)

def get_hours_selection():
    title="Daily rest hours selection"
    list=[]
    start_hours=9
    for m in range(start_hours,15):
        list.append(str(m)+"hours")
    result=pywin.dialogs.list.SelectFromList(title, list)
    print(result)
    if result==None :
        return 0
    return result+start_hours

def get_start_time(s):
    start_time = datetime.datetime.strptime(s[1], '%H:%M')
    return start_time
    duration=datetime.timedelta(minutes=int(s[2]))
    end_time=w1+duration
    work_end_duration=datetime.timedelta(hours=end_time.hour,minutes=end_time.minute)
    oneday_duration=datetime.timedelta(hours=24)

def get_end_time(s):
    start_time = get_start_time(s)
    duration=datetime.timedelta(minutes=int(s[2]))
    end_time=start_time+duration
    return end_time

def get_forbidden_shift_seq(list,rest_time):
    rest_duration=datetime.timedelta(hours=rest_time)
    oneday_duration=datetime.timedelta(hours=24)
    print()
    for i in range(0,len(list)-1):
        start_time=get_start_time(list[i])
        end_time=get_end_time(list[i])
        #print(start_time,end_time)
        for m in range(0,len(list)-1):
            next_days_start_time=get_start_time(list[m])+oneday_duration
            if next_days_start_time<end_time+rest_duration:
                print(list[i][0],'→',list[m][0],'are forbidden shift sequence',next_days_start_time-end_time)
    print()

def get_weekly_rest_time(list,rest_time):
    rest_duration=datetime.timedelta(hours=rest_time)
    oneday_duration=datetime.timedelta(hours=24)
    print()

def get_shift_info():
    filename=get_open_file_name("Open CSV File")
    print(filename,'\n')
    list=[]
    with open(filename, encoding='utf8', newline='') as f:
        csvreader = csv.reader(f)
        for row in csvreader:
            list.append(row)
            #print(row)
    hours=get_hours_selection()
    if hours !=0:
        print("hours=",hours)
        get_forbidden_shift_seq(list,hours)# EU rule is dayily 11hours 


get_shift_info()#Your Operation