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Because Python has a full-blown exception system, it's 
generally better to test for the feature you need than to 
compare mysterious little integers.  For example, suppose 
you need list comprehensions.  You have no idea which 
version of Python first introduced them, and once you think 
you've got it figured out, readers of your code are going 
to have no idea that you *meant* "list comprehensions" when 
you compare sys.version_info against (2, 0).  So clearer 
all around is:

try:
.   eval("[i for i in range(2)]")
except SyntaxError:
.   raise ImportError, "I require list comprehensions"