Apply groupby on multiple columns while taking aggregate in Python

Question

I wish to apply a groupby to multiple columns while running an aggregate function.

Data

country type    en  start   
Japan   aa      25  8/1/2022    
Japan   cc      1   9/1/2022    
US      bb      5   8/1/2022    
US      bb      5   8/1/2022

Desired

country type    en  start    
Japan   aa      25  8/1/2022    
Japan   cc      1   9/1/2022    
US      bb      10  8/1/2022

Doing

df.groupby(['country','type','date'])['en'].sum()

However, this is creating some blank rows. Any suggestion is appreciated.

Asked By: Lynn

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Source

Answer 1

out=df.groupby(['country','type','start'], as_index=False).agg({'en': sum})
out

country     type    start   en
0   Japan   aa  8/1/2022    25
1   Japan   cc  9/1/2022    1
2   US      bb  8/1/2022    10

Answered By: Naveed

Apply groupby on multiple columns while taking aggregate in Python

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