DateTime

kata

本文固定链接 https://www.zybuluo.com/RR/note/785947

实现一个datetime类。
days_to_other 函数计算两个日期之间的天数。返回负数表示日期再之前。
date_after_days 计算多少日以后的日期是那一天，days是负数的话，就是往前计算日期。
MyDateTime类的一些基本函数已经实现好了，并且提供了一个test_random函数，可以试试看自己的代码能获得多少的测试通过率。

from datetime import date
from datetime import timedelta
import random
class MyDateTime(object):
    def __init__(self, y, m, d):
        self.year = y
        self.month = m
        self.day = d
    def days_to_other(self, other):
        return 0
    def date_after_days(self, days):
        return self
    def __add__(self, days):
        return self.date_after_days(days)
    def __sub__(self, other):
        return self.days_to_other(other)
    def __eq__(self, other):
        return [self.year, self.month, self.day] == [other.year, other.month, other.day]
    def __str__(self):
        return "%d-%d-%d" % (self.year, self.month, self.day)
    def __repr__(self):
        return "%d-%d-%d" % (self.year, self.month, self.day)
def test(days):
    delta = (days[1] - days[0]).days
    day0 = MyDateTime(days[0].year,days[0].month,days[0].day)
    day1 = MyDateTime(days[1].year, days[1].month, days[1].day)
    day1_actual = day0.date_after_days(delta)
    delta_actual = day1.days_to_other(day0)
    result = True
    if delta != delta_actual:
        print("Expected {!s} - {!s} is {:d}, actual is {:d}".format(day1, day0, delta, delta_actual))
        result =  False
    if day1 != day1_actual:
        print("Expected {!s} + {:d} is {!s}, actual is {!s}".format(day0, delta, day1, day1_actual))
        result =  False
    return result
def test_random():
    first_day = date(1, 1, 1)
    last_day = date(2017,12,31)
    delta = last_day - first_day
    all_days = [first_day + timedelta(n) for n in range(0,delta.days)]
    total = 1024 * 10
    result = [ test(random.sample(all_days,2)) for i in range (0,total)]
    pass_cnt = sum([1 for i in result if i])
    print ("Test pass rate is {:%}".format(pass_cnt/float(total)))
if __name__ == "__main__":
    test_random()