There's been some talk off-list about changing the posting rules for python-dev, such that non-member post attempts are automatically rejected (i.e. bounced). This means you'd have to be a member to post to the list. I think that's not an inappropriate rule for python-dev.
I don't see a need. What is this trying to prevent?
--Guido van Rossum (home page: http://www.python.org/~guido/)