Mark Jackson wrote:
> "Ric Da Force" <[EMAIL PROTECTED]> writes:
>
>> It is hard to explain but this is what I mean:
>>
>> Dict = {'rt': 'This is repeated', 'sr': 'This is repeated', 'gf': 'This is
>> not'}
>>
>> I want this to return a new dict with string keys and lists containing the
>> previous keys for repeated values.
>>
>> NewDict = {'This is repeated':['rt','sr'],'This is not':['gf']}
>
> NewDict = {}
> for x in Dict.keys():
> try:
> NewDict[Dict[x]].append(x)
> except KeyError:
> NewDict[Dict[x]] = [x]
Or, more up-to-date:
NewDict = {}
for key, val in Dict.iteritems():
NewDict.setdefault(val, []).append(key)
Reinhold
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