Python needs something like CPAN. Python has Cheese Shop (now called PyPi). It's just a link farm; it doesn't host the modules. Nor does it have any useful curation. So there's no quality control, and no way to fix anything short of forking a new version.
That's the big advantage of CPAN. CPAN is the de facto owner of the modules in CPAN, and those modules can be maintained.