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>>> from datetime import datetime, timedelta
>>> datetime.strftime(datetime.now() - timedelta(1), '%Y-%m-%d')
'2015-05-26'
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import datetime
today = datetime.date.today()
one_day = datetime.timedelta(days=1)
yesterday = today - one_day
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from datetime import datetime, timedelta
today = date.today()
yesterday = today - timedelta(days=1)