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Python で日付の計算

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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)

8.1. datetime — 基本的な日付型および時間型

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