Python Pandas replace NaN in one column with value from corresponding row of second column

Question

I am working with this Pandas DataFrame in Python.

File    heat    Farheit Temp_Rating
   1    YesQ         75         N/A
   1    NoR         115         N/         


        

Answer 1

The above mentioned solutions did not work for me. The method I used was:

df.loc[df['foo'].isnull(),'foo'] = df['bar']