Turn Pandas Multi-Index into column

Question

I have a dataframe with 2 index levels:

                         value
Trial    measurement
    1              0        13
                   1         3
            


        

Answer 1

There may be situations when df.reset_index() cannot be used (e.g., when you need the index, too). In this case, use index.get_level_values() to access index values directly:

df['Trial'] = df.index.get_level_values(0)
df['measurement'] = df.index.get_level_values(1)

This will assign index values to individual columns and keep the index.

See the docs for further info.