Python 教程 16 — 类和函数

"""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()

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)

from __future__ import print_function, division


from datetime import datetime

# to avoid duplicating code, I'm importing everything from Time1
from Time1 import *


def increment(t1, seconds):
    """Adds seconds to a Time object."""
    assert valid_time(t1)
    seconds += time_to_int(t1)
    return int_to_time(seconds)

from __future__ import print_function, division


from datetime import datetime

# to avoid duplicating code, I'm importing everything from Time1
from Time1 import *


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)

"""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


def main():
    print("Today's date and the day of the week:")
    today = datetime.today()
    print(today)
    print(today.strftime("%A"))

    print("Your next birthday and how far away it is:")
    #s = input('Enter your birthday in mm/dd/yyyy format: ')
    s = '5/11/1967'
    bday = datetime.strptime(s, '%m/%d/%Y')

    next_bday = bday.replace(year=today.year)
    if next_bday < today:
        next_bday = next_bday.replace(year=today.year+1)
    print(next_bday)

    until_next_bday = next_bday - today
    print(until_next_bday)

    print("Your current age:")
    last_bday = next_bday.replace(year=next_bday.year-1)
    age = last_bday.year - bday.year
    print(age)

    print("For people born on these dates:")
    bday1 = datetime(day=11, month=5, year=1967)
    bday2 = datetime(day=11, month=10, year=2003)
    print(bday1)
    print(bday2)

    print("Double Day is")
    d1 = min(bday1, bday2)
    d2 = max(bday1, bday2)
    dd = d2 + (d2 - d1)
    print(dd)


if __name__ == '__main__':
    main()