pandas: Boolean indexing with multi index

Question

There are many questions here with similar titles, but I couldn\'t find one that\'s addressing this issue.

I have dataframes from many different origins, and I want to f

Answer 1

The more readable (to my liking) solution is to reindex the boolean series (dataframe) to match index of the multi-index df:

df.loc[filt.reindex(df.index, level='a')]