There is no ambiguity in how it's done in python and after 4 years of python, I've never had a problem or even heard a complaint about that. Howver, squishing it into Perl would be hard because you'd have to make it live side-by-side with the currently absolute package names and without introducing new syntax, you would have ambiguity and confusion.
Python doesn't provide any syntax for addressing packages with using an absolute name. You can do it but by digging around in sys.modules but it's not part of the language as such.
All that said, I have rarely missed Perl's absolute package scheme when writing python and I have often missed python's relative package scheme when writing Perl.