ValueError: Must produce aggregated value, if DataFrame contains a DataFrame as an element #39436
Labels
Apply
Apply, Aggregate, Transform, Map
Bug
Groupby
Nested Data
Data where the values are collections (lists, sets, dicts, objects, etc.).
This minimal example assigns the column B the first value of each group:
Hence
Becomes:
If I now modify the value of column B to an array of DataFrames
I get the error:
ValueError: Must produce aggregated value
It seems like this is a bug. There is no logic behind this behavior.
I also think that it did not raise an error in pandas like 2 years ago, when I used the code snippet the last time.
Currently using the newest version 1.2.1
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