PEP8 space after a comma

Question

I'm working on code review, and seeing method declarations like:

def __init__(self,data):

I thought that it should be formatted like this:

def __init__(self, data):

But then I checked PEP 0008 and see no exact statement about that. There is guide about whitespace around operators, and inside parentheses, but no about comma separated list.

If it is not described in PEP8, probably there is some unwritten convention about this? Why I was convinced that this was in PEP8? Should PEP8 be updated?

Answer 1

I guess the reason that most people believe this rule is in PEP8 is pip pep8.

According to their document:

E231 missing whitespace after ‘,’

As most people use this as their style checker, it is easy to be convinced that the rule is really in PEP8.