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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

class Time:

"""Represents the time of day.

attributes: hour, minute, second

"""

def print_time(t):

"""Prints a string representation of the time.

t: Time object

"""

print('%.2d:%.2d:%.2d' % (t.hour, t.minute, t.second))

def int_to_time(seconds):

"""Makes a new Time object.

seconds: int seconds since midnight.

"""

time = Time()

minutes, time.second = divmod(seconds, 60)

time.hour, time.minute = divmod(minutes, 60)

return time

def time_to_int(time):

"""Computes the number of seconds since midnight.

time: Time object.

"""

minutes = time.hour * 60 + time.minute

seconds = minutes * 60 + time.second

return seconds

def add_times(t1, t2):

"""Adds two time objects.

t1, t2: Time

returns: Time

"""

assert valid_time(t1) and valid_time(t2)

seconds = time_to_int(t1) + time_to_int(t2)

return int_to_time(seconds)

def valid_time(time):

"""Checks whether a Time object satisfies the invariants.

time: Time

returns: boolean

"""

if time.hour < 0 or time.minute < 0 or time.second < 0:

return False

if time.minute >= 60 or time.second >= 60:

return False

return True

def main():

# if a movie starts at noon...

noon_time = Time()

noon_time.hour = 12

noon_time.minute = 0

noon_time.second = 0

print('Starts at', end=' ')

print_time(noon_time)

# and the run time of the movie is 109 minutes...

movie_minutes = 109

run_time = int_to_time(movie_minutes * 60)

print('Run time', end=' ')

print_time(run_time)

# what time does the movie end?

end_time = add_times(noon_time, run_time)

print('Ends at', end=' ')

print_time(end_time)

if __name__ == '__main__':

main()