One thing I'm hooked on is Perl's regular expressions. Nick Craig-Wood explains that regular expressions in Python are more clunky but...
Having made the transition from perl to python a couple of years ago, I find myself using regexpes much less. In perl everything looks like it needs a regexp, but python has a much richer set of string methods, eg .startswith, .endswith, good subscripting and the nice "in" operator for strings.So hopefully things will be ok.
