Concat DataFrame Reindexing only valid with uniquely valued Index objects

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You can mitigate this error without having to change your data or remove duplicates. Just create a new index with DataFrame.reset_index:

df = df.reset_index()

The old index is kept as a column in your dataframe, but if you don’t need it you can do:

df = df.reset_index(drop=True)

Some prefer:

df.reset_index(inplace=True, drop=True)

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