when we use "apply" with a custom function with "groupby" on a pandas data frame.

the customer function inside the apply() gets called twice. this is by design of pandas.


Issue in the pandas.

https://github.com/pandas-dev/pandas/issues/2656

My question related to this issue on stackoverflow,

https://stackoverflow.com/questions/53698605/all-columns-are-not-passed-when-we-use-apply-on-result-of-groupby-with-a-custom






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