Carl Banks <pavlovevide...@gmail.com> wrote: > On Mar 27, 11:20 am, Paul Rubin <http://phr...@nospam.invalid> wrote: >> Carl Banks <pavlovevide...@gmail.com> writes: >> > > if x in theDict: >> > > print x, v >> >> > Where does v come from? >> >> Oops, pasted from original. Meant of course "print x, theDict[x]". > > You have look up x twice with that code, whereas you wouldn't have to > with this: > > v = theDict.get(x) > if v is not None: > print x, v >
Note that while you only lookup x in the dict once your code does still involve two dict lookups: once to lookup the get method and once to lookup x. It also involves creating a new bound method object so if performance is a concern you'll find that either the 'if x in theDict: ...' or the try...except are likely to be faster. -- http://mail.python.org/mailman/listinfo/python-list