How to select all columns, except one column in pandas?

Question

I have a dataframe look like this:

import pandas
import numpy as np
df = DataFrame(np.random.rand(4,4), columns = list(\'abcd\'))
df
      a         b                


        

Answer 1

I think a nice solution is with the function filter of pandas and regex (match everything except "b"):

df.filter(regex="^(?!b$)")