CPAN, Unicode, testing, and long term maintainability of the code (Seriously; I can tell the difference between good Perl and bad Perl at a skim. Good Python an

CPAN, Unicode, testing, and long term maintainability of the code (Seriously; I can tell the difference between good Perl and bad Perl at a skim. Good Python and bad Python tend to look the same. Truly awful Python is immediately obvious, but that's not an interesting case to consider.)