Python - Classes and Functions(datetime module)

Think Python

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Think Python (Allen B. Downey (著)、 O'Reilly Media)のChapter 16.(Classes and Functions)のExercises 16-1、2.(No. 3711)を取り組んでみる。

Exercises 16-1、2.(No. 3711)

コード(Emacs)

test

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import datetime


class Time:
    pass


def increment(time, second):
    time.second += second

    if time.second >= 60:
        time.second -= 60
        time.minute += 1

    if time.minute >= 60:
        time.minute -= 60
        time.hour += 1


def time_to_int(time):
    minutes = time.hour * 60 + time.minute
    seconds = minutes * 60 + time.second
    return seconds


def int_to_time(seconds):
    time = Time()
    minutes, time.second = map(int, divmod(seconds, 60))
    time.hour, time.minute = divmod(minutes, 60)
    return time


def add_time(t1, t2):
    assert valid_time(t1) and valid_time(t2)
    seconds = time_to_int(t1) + time_to_inte(t2)
    return int_to_time(seconds)


def valid_time(time):
    if time.hour >= 0 and 0 <= time.minute < 60 and 0 <= time.second < 60:
        return True
    return False


def mul_time(time, n):
    assert(valid_time(time))
    return int_to_time(time_to_int(time) * n)


def average_pace(time, distance):
    return mul_time(time, 1 / distance)

time = Time()
time.hour = 11
time.minute = 59
time.second = 30
distance = 10
average = average_pace(time, distance)
print('{0:02}:{1:02}:{02}'.format(
    average.hour, average.minute, average.second))

print('1.')
date = datetime.date.today()
print(date.strftime('%A'))

print('2.')
birth = input('birth day(YYYY-MM-DD): ')
birth = map(int, birth.split('-'))
birth = datetime.date(*birth)
byear = birth.year
bmonth = birth.month
bday = birth.day
tday = datetime.date.today()
print(tday)
tyear = tday.year
tmonth = tday.month
tday = tday.day
if tyear == byear:
    age = 0
else:
    age = tyear - byear
    if bmonth < tmonth:
        age -= 1
    elif bmonth == tmonth:
        if bday < tday:
            age -= 1
print('age: {0}'.format(age))

tday = datetime.datetime.today()
if tday > datetime.datetime(tday.year, birth.month, birth.day):
    birth_next = datetime.datetime(tday.year + 1, birth.month, birth.day)
else:
    birth_next = datetime.datetime(tday.year, birth.month, birth.date)
t = birth_next - tday
d = t.days
h = t.seconds // (60 * 60)
m = t.seconds // 60 - h * 60
s = t.seconds - h * 60 * 60 - m * 60
print('until next birth day: {0} days, {1} hours, {2} minutes, {3} seconds'
      .format(d, h, m, s))

print('3.')
b1 = datetime.date(2000, 1, 2)
b2 = datetime.date(2010, 1, 2)
b = b2 - b1
print(b2 + b)

n = 5
b1 = datetime.date(2000, 1, 2)
b2 = datetime.date(2010, 1, 2)
b = b2 - b1
print(b2 + 1 / (n - 1) * b)

入出力結果(Terminal, IPython)

$ ./sample1.py
01:11:57
1.
Wednesday
2.
birth day(YYYY-MM-DD): 2000-1-2
2016-10-05
age: 15
until next birth day: 88 days, 7 hours, 55 minutes, 8 seconds
3.
2020-01-03
2012-07-03
$