["python","pandas","dataframe","numpy","apply"]
How can I use the apply() function for a single column?

I have a pandas dataframe with multiple columns. I want to change the values of the only the first column without affecting the other columns. How can I do that using apply() in pandas?
Given a sample dataframe df as: a b 0 1 2 1 2 3 2 3 4 3 4 5 what you want is: df['a'] = df['a'].apply(lambda x: x + 1) that returns: a b 0 2 2 1 3 3 2 4 4 3 5 5