Counter in Python

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A counter is a container that holds elements as dictionary keys and their counts as dictionary values.

Let’s understand the concept through programming

from collections import Counter
nums=[1,2,3,1,4,5,1]
counter=Counter(nums)
print(counter) #o/p=Counter({1: 3, 2: 1, 3: 1, 4: 1, 5: 1})
print(counter.keys()) #o/p=dict_keys([1, 2, 3, 4, 5])
print(counter.values()) #o/p=dict_values([3, 1, 1, 1, 1])
## One difference between normal python dict and Counter is
## for missing elements it return zero count but dict object raise a KeyError
print(counter[80]) ## o/p=0 You can see key 80 is not found in counter

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