collections counter

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Ozzie
04 May 2020
1# importing the collections module
2import collections
3# intializing the arr
4arr = [1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3]
5# getting the elements frequencies using Counter class
6elements_count = collections.Counter(arr)
7# printing the element and the frequency
8for key, value in elements_count.items():
9   print(f"{key}: {value}")
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Sophie
24 May 2017
1sum(c.values())                 # total of all counts
2c.clear()                       # reset all counts
3list(c)                         # list unique elements
4set(c)                          # convert to a set
5dict(c)                         # convert to a regular dictionary
6c.items()                       # convert to a list of (elem, cnt) pairs
7Counter(dict(list_of_pairs))    # convert from a list of (elem, cnt) pairs
8c.most_common()[:-n-1:-1]       # n least common elements
9c += Counter()                  # remove zero and negative counts
10
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