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def dayOfMonth(date):
if date.month == 12:
return 31
else:
return (date.replace(month=date.month+1, day=1) - datetime.timedelta(days=1)).day

ºóÀ´ÔÚ¹úÍâÍøÕ¾ÉÏ£¬Å¼È»·¢ÏÖÁËÒ»¸ö˵Ã÷£¬·¢ÏÖ£¬Ô­À´£¬pythonÖл¹ÊÇ´øÓÐÕâÑùµÄº¯ÊýµÄ£¡
monthrange(year, month)
    Returns weekday of first day of the month and number of days in month, for the specified year and month.
Õâ¸öº¯Êý¾ÍÊÇ£¬·µ»ØÐÇÆÚµÄÊýÁ¿ºÍ±¾ÔµÄÌìÊý£¬ÐèÒªÒýÓÃcalendar
>>>

import
calendar
>>>
calendar
.
monthrange
(
2002
,
1
)
(
1
,

31
)
>>>
calendar
.
monthrange
(
2008
,
2
)
(
4
,

29
)
>>>
calendar
.
monthrange
(
2100
,
2
)
(
0
,

28
)


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