问题
I am trying to find the percentage contribution made by each date group. Given below is how my data looks like.
Expecting to find contribution of each product for a given date.
date, product, quantity
2020-01, prod_a, 100
2020-01, prod_b, 200
2020-01, prod_c, 20
2020-01, prod_d, 50
2020-02, prod_a, 30
2020-02, prod_b, 30
2020-02, prod_c, 40
My expected output would be as below:
date, product, quantity, prct_contributed
2020-01, prod_a, 100, 27%
2020-01, prod_b, 200, 54%
2020-01, prod_c, 20, 5%
2020-01, prod_d, 50, 14%
2020-02, prod_a, 30, 30%
2020-02, prod_b, 30, 30%
2020-02, prod_c, 40, 40%
回答1:
Use groupby().transform():
df['quantity'] / df.groupby('date')['quantity'].transform('sum')
来源：https://stackoverflow.com/questions/65597313/pandas-finding-percent-contributed-by-each-group