Create an empty data frame with index from another data frame

df2 = pd.DataFrame(index=df1.index)

This will create a DataFrame with no columns but just an index, and it will be the same index as in the df1.

It's better to set index as df1.index.copy()

df2 = pd.DataFrame(index=df1.index.copy())

You can use df1.index is df2.index to check whether they are the same object

You can also assign the index of a dataframe to another dataframe directly.

df2.index=df1.index

You can use this short code:

df2=df1[[]].copy()