pd count how many item occurs in another column
df['Counts'] = df.groupby(['Color'])['Value'].transform('count')pd count how many item occurs in another column
df['Counts'] = df.groupby(['Color'])['Value'].transform('count')pandas count
>>> df.set_index(["Person", "Single"]).count(level="Person")
Age
Person
John 2
Lewis 1
Myla 1Copyright © 2021 Codeinu
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