迭代器求迄今为止所有的闰年 

 1 #写一个迭代器，要求输出迄今为止所有的闰年
 2 import datetime as dt
 3 
 4 class LeapYear:
 5     def __init__(self):
 6         self.this_year = dt.date.today().year
 7 
 8 
 9     def isLeapYear(self,year):
10         if (year % 4 == 0 and year % 100 != 0)\
11            or (year % 100 == 0 and year % 400 ==0):
12             return True
13         else:
14             return False
15 
16 
17     def __iter__(self):
18         return self
19 
20     def __next__(self):
21         while not self.isLeapYear(self.this_year):
22             self.this_year -= 1
23 
24         temp = self.this_year
25 
26         self.this_year -= 1
27 
28         return temp
29 
30 
31 leapyear = LeapYear()
32 for i in leapyear:
33     if i >= 1900:
34         print(i)
35     else:
36         break

 

posted @ 2017-03-13 21:44  道高一尺  阅读(303)  评论(0)    收藏  举报