How to replace a string in a function with another string in Python?

Question

I want to do this:

>>> special = \'x\'
>>> random_function(\'Hello how are you\')
\'xxxxx xxx xxx xxx\'

I basically want

Answer 1

This can be easily done with regex:

>>> re.sub('[A-Za-z]', 'x', 'Hello how are you')
'xxxxx xxx xxx xxx'