python - 日期不按顺序排列

Question

为什么从十二月开始？并且 1 1 在末尾重复。迭代给定年份中所有日期的更 Pythonic 方法是什么(处理闰年)？

import calendar

a = calendar.Calendar(0)
for b in range(1,13):
    for x in a.itermonthdates(2016,b):
        print x.month, x.day

输出:

12 28
12 29
12 30
12 31
1 1
1 2
1 3
..
..
..

完整输出:

http://pastebin.com/nnP4ADQK

Answer 1

itermonthdates返回完整的周数:

itermonthdates(year, month) Return an iterator for the month month (1–12) in the year year. This iterator will return all days (as datetime.date objects) for the month and all days before the start of the month or after the end of the month that are required to get a complete week.

您可以拒绝年份不是 2016 年的日期:

import calendar

a = calendar.Calendar(0)
g = (x for b in xrange(1, 13) for x in a.itermonthdates(2016, b) if x.year == 2016)
print next(g)

输出:

2016-01-01