Pandas fill multiple columns with 0 when null.

Question

In pandas, I can fill a single column with 0 as follows:

df['COL'].fillna(0, inplace=True)

is it possible to fill multiple columns in same step?

Answer 1

Instead of col just pass a list of columns. Like this:

columns = ["col1", "col2", "col3"]

df[columns].fillna(0, inplace=True)