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pandas python

Week of a month pandas

I’m trying to get week on a month, some months might have four weeks some might have five.
For each date i would like to know to which week does it belongs to. I’m mostly interested in the last week of the month.

data = pd.DataFrame(pd.date_range(' 1/ 1/ 2000', periods = 100, freq ='D'))
0 2000-01-01
1 2000-01-02
2 2000-01-03
3 2000-01-04
4 2000-01-05
5 2000-01-06
6 2000-01-07