import datetime
 
#Declarations:
revisedTimeList = []
timeRangeList = []
 
def inputTimes() : 
    #Asks the user to input times, to be used as column headers, returns a list of strings representing time ranges. 
 
    studyTime = input("Please enter your study periods throughout the day (hh:mm hh:mm): ") 
    timeList = studyTime.split()
    for time in timeList :
        structTime = datetime.datetime.strptime(time, "%I:%M%p")
        formattedTime = datetime.datetime.strftime(structTime, "%H:%M")
        revisedTimeList.append(formattedTime)
    timeRangeList = formatTimes(revisedTimeList)
    return timeRangeList
 
def formatTimes(revisedTimeList) :
    #Grouping individual times to create time ranges:
 
    listOfTimes = revisedTimeList 
    iteratorList = iter(listOfTimes)
    for time in iteratorList :
        timeRange = time + " - " + next(iteratorList)
        timeRangeList.append(timeRange)
    return timeRangeList
 
print(inputTimes())

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

MDk6MDBBTSAxMTowMEFNIDExOjE1QU0gMDE6MDBQTSAwMjowMFBNIDAzOjMwUE0gMDM6NDVQTSAwNTowMFBNIA==

09:00AM 11:00AM 11:15AM 01:00PM 02:00PM 03:30PM 03:45PM 05:00PM