String comparison

[Matt Gerrans]

Nice metaphor -- a good chuckle...

By the way, what is the Pythonic way of doing case-insensitive string
comparisions?    I've been in the habit of doing something like this:

if s1.lower() == s2.lower():
   blah()

I suppose this would do the trick, too:

if re.match( '^' + s1 + '$', s2, re.I ):
   blah()

I'm not sure which of these is better (or maybe it is neither!), though, so,
of course, I'd like to know what the One True Path is...