[Python] how to apply a function to multiple columns in a pandas dataframe at one time

I frequently deal with data which is poorly formatted (I.e. number fields are not consistent etc)

There may be other ways, which I am not aware of but the way I format a single column in a dataframe is by using a function and mapping the column to that function.

format = df.column_name.map(format_number)


Question: 1 - what if I have a dataframe with 50 columns, and want to apply that formatting to multiple columns, etc column 1, 3, 5, 7, 9,

Can you go:

format = df.1,3,5,9.map(format_number)


.. This way I could format all my number columns in one line?

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