Learning Pyhton - Functional Programming - How intersect/difference two dict with dict/values? fast!

Alexander Gattin xrgtn at yandex.ru
Thu Nov 11 11:04:12 CET 2010


On Thu, Nov 11, 2010 at 11:51:33AM +0200,
Alexander Gattin wrote:
> functional-style code emerges:
> 
> > >>> dict(filter(lambda t: t[1],
> > ...     map(lambda k: (k, filter(lambda v: v in dict2[k][0], dict1[k][0])),
> > ...        filter(dict2.has_key, dict1.iterkeys()))
> > ...        )
> > ...     )

Sorry, the indentation for the above code
is plain wrong. I'm not accustomed to
lisp-indenting, and only have managed to produce
the next version below:

> >>> dict(filter(lambda t: t[1],
> ...             map(lambda k: (k, filter(lambda v: v in dict2[k][0],
> ...                                      dict1[k][0]
> ...                                     )
> ...                           ),
> ...                 filter(dict2.has_key, dict1.iterkeys())
> ...                )
> ...            )
> ...     )
> {'ac': [1, 3, '79b'], 'ab': [2, 'd3']}
> >>> 

-- 
With best regards,
xrgtn



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