Ola Natvig wrote:
If some keys has the same value as the item this will cause problems
because keys in your result dictionary can be overwritten. Could it be a
option to build the result dictionary as a dictionary with the values
as the keys, and lists of keys as the value. Perhaps you need to use a
loop for this.
<<Python 2.4>>
.>>> d = dict(foo=1, bar=1, bob=7, jane=42, mary=16, fred=16)
.>>> from itertools import groupby
.>>> val = d.__getitem__
.>>> grouped = groupby(sorted(d.iterkeys(), key=val), val)
.>>> r = dict((value, list(keys)) for value, keys in grouped)
.>>> r
{16: ['mary', 'fred'], 1: ['bar', 'foo'], 42: ['jane'], 7: ['bob']}
Cheers,
Nick.
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Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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