Harry George's pyperlish provides perl idioms in python. (download page)
This perhaps makes it easier for perl programmers to transition to python, as they don't need to relearn everything at once.
The advantages of reducing the barrier to entry for potential python programmers seems worth a bit of odd perlish code during their learning process. No?
Idiom translation dictionaries, such as RubyFromOtherLanguages, are another approach to this issue.
Development of pyperlish stopped in 2001, as the author completed his own spin-up on python idioms. Anyone who wants to grab it, is welcome to it.
pyperlish was formerly called pyperl, before the current pyperl grabbed the name.