Creating an empty MultiIndex

Question

I would like to create an empty DataFrame with a MultiIndex before assigning rows to it. I already found that empty DataFrames

Answer 1

Another solution which is maybe a little simpler is to use the function set_index:

>>> import pandas as pd
>>> df = pd.DataFrame(columns=['one', 'two', 'three', 'alpha', 'beta'])
>>> df = df.set_index(['one', 'two', 'three'])
>>> df
Empty DataFrame
Columns: [alpha, beta]
Index: []
>>> df.loc[('apple','banana','cherry'),:] = [0.1, 0.2]
>>> df
                    alpha beta
one   two    three            
apple banana cherry   0.1  0.2