renaming row value in pandas

1# if the row value in column 'is_blue' is 1 
2# Change the row value to 'Yes' 
3# otherwise change it to 'No'
4df['is_blue'] = df['is_blue'].apply(lambda x: 'Yes' if (x == 1) else 'No') 
5
6
7# You can also use mapping to accomplish the same result
8# Warning: Mapping only works once on the same column creates NaN's otherwise
9df['is_blue'] = df['is_blue'].map({0: 'No', 1: 'Yes'})