[Tutor] changing dictionary to lowercase

[Christian Witts]

On 2011/10/28 11:51 AM, Albert-Jan Roskam wrote:
> It would be nice to generalize the solution so it could also handle
> definitions={"Deprecated": "No longer in use", "DEPRECATED":  "No 
> longer in use"}
> These are unique now, but after turning them into lower case not anymore.
> new_d = {}
> for d in definitions:
>     try:
>         new_d[d.lower()].append(definitions[d])
>     except TypeError:
>         new_d[d.lower()] = [definitions[d]]
> Cheers!!
> Albert-Jan
>
>
> <snip>
>
>
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To save yourself the try/except you can use defaultdict which is part of 
the collections module.

from collections import defaultdict
new_d = defaultdict(list)
for key, value in definitions.iteritems():
     new_d[key.lower()].append(value)

-- 

Christian Witts
Python Developer

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