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Time1_soln.py
135 lines (96 loc) · 3.29 KB
/
Time1_soln.py
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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
from datetime import datetime
# to avoid duplicating code, I'm importing everything from Time1
from Time1 import *
def is_after(t1, t2):
"""Returns True if t1 is after t2; false otherwise."""
return (t1.hour, t1.minute, t1.second) > (t2.hour, t2.minute, t2.second)
def increment(t1, seconds):
"""Adds seconds to a Time object."""
assert valid_time(t1)
seconds += time_to_int(t1)
return int_to_time(seconds)
def mul_time(t1, factor):
"""Multiplies a Time object by a factor."""
assert valid_time(t1)
seconds = time_to_int(t1) * factor
return int_to_time(seconds)
def days_until_birthday(birthday):
"""How long until my next birthday?"""
today = datetime.today()
# when is my birthday this year?
next_birthday = datetime(today.year, birthday.month, birthday.day)
# if it has gone by, when will it be next year
if today > next_birthday:
next_birthday = datetime(today.year+1, birthday.month, birthday.day)
# subtraction on datetime objects returns a timedelta object
delta = next_birthday - today
return delta.days
def double_day(b1, b2):
"""Compute the day when one person is twice as old as the other.
b1: datetime birthday of the younger person
b2: datetime birthday of the older person
"""
assert b1 > b2
delta = b1 - b2
dday = b1 + delta
return dday
def datetime_exercises():
"""Exercise solutions."""
# print today's day of the week
today = datetime.today()
print(today.weekday())
print(today.strftime('%A'))
# compute the number of days until the next birthday
# (note that it usually gets rounded down)
birthday = datetime(1967, 5, 2)
print('Days until birthday', end=' ')
print(days_until_birthday(birthday))
# compute the day one person is twice as old as another
b1 = datetime(2006, 12, 26)
b2 = datetime(2003, 10, 11)
print('Double Day', end=' ')
print(double_day(b1, b2))
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)
print('Does it end after it begins?', end=' ')
print(is_after(end_time, noon_time))
print('Home by', end=' ')
travel_time = 600 # 10 minutes
home_time = increment(end_time, travel_time)
print_time(home_time)
race_time = Time()
race_time.hour = 1
race_time.minute = 34
race_time.second = 5
print('Half marathon time', end=' ')
print_time(race_time)
distance = 13.1 # miles
pace = mul_time(race_time, 1/distance)
print('Time per mile', end=' ')
print_time(pace)
datetime_exercises()
if __name__ == '__main__':
main()