Python data analysis dataframe converts dates to weeks

When doing data analysis with Python, how to add a new column of weeks “week” and change the date, such as “2021-03-02” to the nth week of 2021?

Introduce two methods:
the dataframe of my data is called sample, which has the feature “date”. Now add a new feature “week”
1 dt.week


2. Use datetimeindex

df['week'] = pd.DatetimeIndex(sample['date']).week

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