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-   -   Re: A little morning puzzle (http://www.velocityreviews.com/forums/t952417-re-a-little-morning-puzzle.html)

Ian Kelly 09-19-2012 03:16 PM

Re: A little morning puzzle
 
On Wed, Sep 19, 2012 at 6:13 AM, Antoon Pardon
<antoon.pardon@rece.vub.ac.be> wrote:
> On 19-09-12 13:17, Neal Becker wrote:
>> I have a list of dictionaries. They all have the same keys. I want to find the
>> set of keys where all the dictionaries have the same values. Suggestions?

> common_items = reduce(opereator.__and__, [set(dct.iteritems()) for dct
> in lst])
> common_keys = set([item[0] for item in common_items])


You can use dictviews for that:

common_items = reduce(operator.__and__, (d.viewitems() for d in ds))
common_keys = [item[0] for item in common_items]


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