freq count in python

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Montserrat
01 Apr 2018
1import collections
2a = [1,1,1,1,2,2,2,2,3,3,4,5,5]
3counter=collections.Counter(a)
4print(counter)
5# Counter({1: 4, 2: 4, 3: 2, 5: 2, 4: 1})
6print(counter.values())
7# [4, 4, 2, 1, 2]
8print(counter.keys())
9# [1, 2, 3, 4, 5]
10print(counter.most_common(3))
11# [(1, 4), (2, 4), (3, 2)]
Francesco
03 Jun 2017
1freq = {} 
2    for item in my_list: 
3        if (item in freq): 
4            freq[item] += 1
5        else: 
6            freq[item] = 1
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