昨日の日時を取りたいと思ったら、1日分の timedelta を作って、date オブジェクトをそのまま引いてあげればいい。
>>> import datetime
>>> from datetime import timedelta
>>> t = timedelta(days = 1)
>>> d = datetime.date.today()
>>> d
datetime.date(2013, 3, 27)
>>> d - t
datetime.date(2013, 3, 26)
More than 5 years have passed since last update.
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