Pandas concat: ValueError: Shape of passed values is blah, indices imply blah2

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I had a similar problem (join worked, but concat failed).

Check for duplicate index values in df1 and s1, (e.g. df1.index.is_unique)

Removing duplicate index values (e.g., df.drop_duplicates(inplace=True)) or one of the methods here https://stackoverflow.com/a/34297689/7163376 should resolve it.

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