Pandas query function not working with spaces in column names

Question

I have a dataframe with spaces in column names. I am trying to use query method to get the results. It is working fine with \'c\' column but getting error for \

Answer 1

It is not possible yet. Check github issue #6508:

Note that in reality .query is just a nice-to-have interface, in fact it has very specific guarantees, meaning its meant to parse like a query language, and not a fully general interface.

Reason is for query need string to be a valid python expression, so column names must be valid python identifiers.

Solution is boolean indexing:

df = df[df['a b'] == 5]