On Fri, 05 Mar 2010 17:22:14 -0800, Pete Emerson wrote:
> Why isn't the behavior of collections.defaultdict the default for a
> dict?
Why would it be?
If you look up a key in a dict:
addressbook['Barney Rubble']
and you don't actually have Barney's address, should Python guess and
make something up?
In general, looking up a missing key is an error, and errors should never
pass silently unless explicitly silenced.
And for those cases where missing keys are not errors, you're spoiled for
choice:
dict.get
dict.setdefault
collections.defaultdict
try:
dict[key]
except KeyError:
do something else
Or even:
if key in dict:
dict[key]
else:
do something else
--
Steven
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