datetime - How to derive the week start for a given (iso) weeknumber / year in python -

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this question has answer here:

i know can use datetime.isocalendar() getting weeknumber given date. how can inverse, given weeknumber , year retrieve first day of week.

if you're limited stdlib following:

>>> datetime.datetime.strptime('2011, 4, 0', '%y, %u, %w') datetime.datetime(2011, 1, 23, 0, 0)

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