Replace None with NaN in pandas dataframe

Question

I have table x:

        website
0   http://www.google.com/
1   http://www.yahoo.com
2   None

I want to replace python None with pa

Answer 1

You can use DataFrame.fillna or Series.fillna which will replace the Python object None, not the string 'None'.

import pandas as pd
import numpy as np

For dataframe:

df = df.fillna(value=np.nan)

For column or series:

df.mycol.fillna(value=np.nan, inplace=True)