forward fill specific columns in pandas dataframe

Question

If I have a dataframe with multiple columns [\'x\', \'y\', \'z\'], how do I forward fill only one column \'x\'? Or a group of columns [\'x\',

Answer 1

I used below code, Here for X and Y method can be different also instead of ffill().

 df1 = df.fillna({
        'X' : df['X'].ffill(),
        'Y' : df['Y'].ffill(),
    })