Replace WhiteSpace with a 0 in Pandas (Python 3)

Question

simple question here -- how do I replace all of the whitespaces in a column with a zero?

For example:

  Name       Age
  John       12
  Mary 
  Tim        15

into

  Name       Age
  John       12
  Mary       0
  Tim        15

I've been trying using something like this but I am unsure how Pandas actually reads whitespace:

 merged['Age'].replace(" ", 0).bfill()

Any ideas?

Answer 1

merged['Age'] = merged['Age'].apply(lambda x: 0 if x == ' ' else x)