Filtering information from Dictionaries in Python

Question

I have a function:

def most_common(dictionary, integer):

'Integer' must be a positive number. This function must update the list to include the 'Integer' most common words in the dictionary.

For example

>>> def most_common({'ONE': 1, 'TWO': 2, 'THREE': 3}, 2)
>>> {'TWO' : 2, 'THREE' : 3}

The only code I have written for this function so far is to sort the dictionary.

want you to count most popular integer in the list i.e. list elements order by desc? — loretoparisi, Dec 03 '16 at 21:49
@SheepPerplexed your behaviour is just exemplary. Keep it like this! one small advice on your future answers though: test them, and provide an explanation around them, they'll be better recieved than code-only answers. — Jean-François Fabre, Dec 03 '16 at 21:57

TigerhawkT3 · Answer 1 · 2016-12-03T21:55:50.550

3

If you want the most common words, use collections.Counter and its most_common method:

>>> import collections
>>> L = {'One' : 1, 'Two' : 2, 'Three' : 3}
>>> result = collections.Counter(L)
>>> dict(result.most_common(2)
{'Two': 2, 'Three': 3}

edited Dec 03 '16 at 21:55

answered Dec 03 '16 at 21:49

TigerhawkT3

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`dict(result.most_common(2))` seems a little neater IMO – Chris_Rands Dec 03 '16 at 21:53
@Chris_Rands - Neat! – TigerhawkT3 Dec 03 '16 at 21:55
Hi thank you for your responses. I cannot use the `collections.Counter` unfortunately. I cannot import anything must use more basic python. Do you think you can still help? – dontworry123 Dec 03 '16 at 22:07
@dontworry123 use `lambda` and see my tests below! – loretoparisi Dec 03 '16 at 22:17
@dontworry123 see http://stackoverflow.com/a/40953104/758836 – loretoparisi Dec 03 '16 at 22:23

score 0 · Answer 2 · answered Dec 03 '16 at 22:03

0

dict(sorted([(k,v) for k, v in L.items()], key=lambda x: x[1])[-2:])

answered Dec 03 '16 at 22:03

gipsy

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Filtering information from Dictionaries in Python

2 Answers2