/Python/Count occurrences of one variable grouped by another python

Count occurrences of one variable grouped by another python

>>> 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

Similar codes

0 vote111 views1 answer
Python loc id in list
Python
1 vote121 views1 answer
Creating folder in s3 bucket python
Python
0 vote109 views1 answer
Test register user mismatched passwords
Python
1 vote121 views2 answers
Python print utf-8
Python
0 vote122 views1 answer
Matplotlib set y lim
Python
5 votes107 views1 answer
Timer 1hr
Python
51 votes163 views6 answers
Reverse array
Python
1 vote111 views1 answer
Python get newest file in directory
Python
30 votes70 views2 answers
Mysql.connector methods python
Python
1 vote146 views2 answers
Django url static
Python Django