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count occurrences of one variable grouped by another python
“count occurrences of one variable grouped by another python” Code Answer
count occurrences of one variable grouped by another python
python by
Dark Duck
on May 31 2020
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>>> data = pd.DataFrame({'user_id' : ['a1', 'a1', 'a1', 'a2','a2','a2','a3','a3','a3'], 'product_id' : ['p1','p1','p2','p1','p1','p1','p2','p2','p3']}) >>> count_series = data.groupby(['user_id', 'product_id']).size() >>> count_series user_id product_id a1 p1 2 p2 1 a2 p1 3 a3 p2 2 p3 1 dtype: int64 >>> new_df = count_series.to_frame(name = 'size').reset_index() >>> new_df user_id product_id size 0 a1 p1 2 1 a1 p2 1 2 a2 p1 3 3 a3 p2 2 4 a3 p3 1 >>> new_df['size'] 0 2 1 1 2 3 3 2 4 1 Name: size, dtype: int64
Source:
stackoverflow.com
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