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How do I achieve this with pandas

inputindex  |country_id|country_name|  value | desc
1            2                 JAV       3         a
2            3                 GBR       7         b
3            4                 GBR       5         e
4            7                  BDI      6         r

output

index | country_id|country_name| value| desc
1              2       JAV       3       a
2              3       GBR       12     b,e
4              7       BDI       6       r
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  • 1
    simple groupby+agg with sum and list or str.join Commented Jan 28, 2022 at 8:12
  • 1
    @mozway - and first Commented Jan 28, 2022 at 8:13

1 Answer 1

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1

Use GroupBy.agg with 3 different functions - GroupBy.first, sum and join:

df = (df.groupby('country_name', as_index=False, sort=False)
        .agg(country_id = ('country_id', 'first'),
             value = ('value','sum'),
             desc = ('desc', ','.join)))
print (df)
  country_name  country_id  value desc
0          JAV           2      3    a
1          GBR           3     12  b,e
2          BDI           7      6    r
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