Pandas select only numeric or integer field from dataframe

Question

I have this Pandas dataframe (df):

     A    B
0    1    green
1    2    red
2    s    blue
3    3    yellow
4    b    black

A type is obje

Answer 1

Personally, I think it will be more succinct to just use the built-in map compared with .apply()

In [13]: df[map(pred, df['B'])]