python get yesterday and today

问题描述：你想获得今天的日期，并以此计算昨天和明天的日期。

这里主要用到了Python datetime模块的date和timedelta两个子类。 解决方法如下：

import datetime
today = datetime.date.today()
delta_day = datetime.timedelta(days=1)
yesterday = today - delta_day
tomorrow = today + delta_day
print 'Today is: ', today
print 'Yesterday is: ', yesterday
print 'Tomorrow is: ', tomorrow