How to get week number in Python?

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datetime.date has a isocalendar() method, which returns a tuple containing the calendar week:

>>> import datetime
>>> datetime.date(2010, 6, 16).isocalendar()[1]
24

datetime.date.isocalendar() is an instance-method returning a tuple containing year, weeknumber and weekday in respective order for the given date instance.

In Python 3.9+ isocalendar() returns a namedtuple with the fields year, week and weekday which means you can access the week explicitly using a named attribute:

>>> import datetime
>>> datetime.date(2010, 6, 16).isocalendar().week
24

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