11.16. Counter#

from collections import Counter

11.16.1. Logic#

  • Counter(pass any iterable here)

    • It will give dictionary of keys(elements) and values(count)

      • Accessing the count:

        • Since it returns dict,you can use counter.keys(),counter.values() and counter.items()

        • or if you want count of specific key,you can do counter()[‘that key’]

11.16.2. Example#

l=[1,2,3,3,4,5,5,5,5,5,5,5,5,5,5]

print(Counter(l).keys())
print(Counter(l).values())
print(Counter(l).items())

dict_keys([1, 2, 3, 4, 5])
dict_values([1, 1, 2, 1, 10])
dict_items([(1, 1), (2, 1), (3, 2), (4, 1), (5, 10)])

11.16.3. Counting in lists#

l=[1,2,3,3,4,5,5,5,5,5,5,5,5,5,5]
Counter(l)

Counter({1: 1, 2: 1, 3: 2, 4: 1, 5: 10})

11.16.4. Counting in String#

s='sahilsahil'
Counter(s)

Counter({'s': 2, 'a': 2, 'h': 2, 'i': 2, 'l': 2})

11.16.5. Counting in dictionary#

d={
    'a':10,
    'b':20,
    'c':40
}

Counter(d)

Counter({'a': 10, 'b': 20, 'c': 40})

11.16.6. Getting count of specific element#

Counter(d)['c']

40

11.16.7. Extra Functions we can use on Counter object#

l=[1,2,2,3,4,4,5,6,6,6,6,6]
print(Counter(l).most_common(1)) # highest occurence(count)
print(Counter(l).most_common(2)) # top 2 based on occurence(count)

[(6, 5)]
[(6, 5), (2, 2)]

11.16.8. More#

  • Since it gives dict object,we can use all the dict operations and perform conditions and everything

[k for k,v in Counter(l).items() if v==5]

[6]