"Interesting side-effect though is that copy/pasting of Python is harder because people often get the whitespaces wrong."

I am definitely not nearly as "advanced" in Python as I am with Perl (I still learn things in Perl daily so I still classify myself as ~intermediate), but this is the number one issue I find with Python folks who say they know what they are doing. See it a lot in helping newbs at work (along with the confusion of having multiple classes per file).

I don't have anything against that at all as we are all new at some point with everything, but what does upset me is when a new employee (or prospect) claims "I'm an expert" and makes that hugely obvious mistake (whitespace issue). To me, it's akin to someone using Perl to perform one of our initial programming challenges but doesn't use use strict; or use warnings;.