I like to believe that I am a competent software developer in both Python and Java. As a competent developer, I find that certain things are generally much easier than other things.
For instance, I just spent a frustrating week working out how to install a Shibboleth identity provider, yet I never got it working quite satisfactorily. Then, after spending 30 minutes with Python-openid, I had an identity provider server running and I already felt quite confident with it.
It’s as if Java and Python are not really in the same league. There is no way to prove that, though. Sometimes Java wins anyway.