Filtering Python dictionaries

Here’s a little Python snippet I just made up, but is immensely useful because I couldn’t find an obvious method like filter that applied to dictionaries instead of lists. This code pulls out specific key-value pairs from a dictionary and puts them in a new dictionary.

>>> x={ 'test1':1, 'test2':2, 'test3':3 }
>>> my_keys = ('test1','test2')
>>> y=dict(filter(lambda t: t[0] in my_keys, x.items()))
{'test': 1, 'test2': 2}

Obviously the performance characteristics of this won’t scale, but if you just want a few keys out of a dictionary then you should be fine.



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