Answers for "how to get the count of a elements in each column after groupby"

2

pandas groupby count as new column

In [12]: df.groupby(["item", "color"])["id"].count().reset_index(name="count")
Out[12]:
    item  color  count
0    car  black      2
1  truck   blue      1
2  truck    red      2
Posted by: Guest on September-17-2020

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