Fast Dictionary Access
Sat Jun 27 05:58:21 EDT 2009
Thomas Lehmann <Iris-und-Thomas-Lehmann at T-Online.de> writes:
> if data.has_key(key):
> value = data[key]
> But this does mean (does it?) that the dictionary is searched two
> times! If so, can somebody show me how to do this in one step?
value = data.get(key, None)
sets value to None if the key is not in the dictionary. You can use
some other sentinel if None might actually be a value in the
dictionary. One way to get a unique sentinel is:
sentinel = object()
You can also use exception handling (this is quite efficient in Python)
as Chris Rebert mentioned.
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