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

Note that convert_objects is deprecated

>>> df[['A']].convert_objects(convert_numeric=True)
__main__:1: FutureWarning: convert_objects is deprecated.  Use the data-type specific converters pd.to_datetime, pd.to_timedelta and pd.to_numeric.

From 0.17.0: use pd.to_numeric, set errors='coerce' so that incorrect parsing returns NaN. Use notnull to return a boolean mask to use on the original dataframe:

>>> df[pd.to_numeric(df.A, errors='coerce').notnull()]
   A       B
0  1   green
1  2     red
3  3  yellow