Code review or linters. There's a few linters out there, and they're widely known in the community with loads of documentation/examples. I believe there's Perl::Critic, but I've never seen it used on the few Perl projects I've worked on.

(As an aside, you can make it more horrible because you don't even need a "run" function - just stuff it into the *.py file and it'll get executed :) )