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I want to get the sum of a column based on whether it matches multiple strings. For example,

pd.DataFrame({'key': ['b', 'b d', 'a', 'c t', 'a', 'b p'], 'data1': range(6)})

I want to be able to get the sum for data1 column IF the strings in the key column contain 'b' and 'c'. The sum in this case would be 9.

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  • df.loc[df['key'].isin(['b','c']), 'data1'].sum() Commented Jan 18, 2021 at 17:27
  • Thank you for the answer. My question was probably not clear so I have edited it for more clarity. Commented Jan 18, 2021 at 17:32

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Try this using regex express and string accessor, .str with contains:

df.loc[df['key'].str.contains('b|c'), 'data1'].sum()

Output:

9
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