Pandas replacing values on specific columns

Question

I am aware of these two similar questions:

Pandas replace values

Pandas: Replacing column values in dataframe

I used a different approach for substitutin

Answer 1

to_rep = dict(zip([1, 3, 2],[3, 6, 7]))
df.replace({'A':to_rep, 'B':to_rep}, inplace = True)

This will return:

   A  B  C
0  3  7  8
1  6  4  8
2  5  3  8