counter 및 count 예제

import collections

myList=['a','b','c','a','b','d']

myCounter=collections.Counter(myList)

myCounter

  Counter({'a': 2, 'b': 2, 'c': 1, 'd': 1})

print(myCounter['a'])

  2

yourList=['a','b','b','e']

ourList=myList+yourList

ourList

  ['a', 'b', 'c', 'a', 'b', 'd', 'a', 'b', 'b', 'e']

type(ourList)

  list

ourCounter=collections.Counter(ourList)

ourCounter

  Counter({'a': 3, 'b': 4, 'c': 1, 'd': 1, 'e': 1})

ourCounter.most_common(2)

  [('b', 4), ('a', 3)]

ourCounter.keys()

  dict_keys(['a', 'b', 'c', 'd', 'e'])

ourCounter.items()

  dict_items([('a', 3), ('b', 4), ('c', 1), ('d', 1), ('e', 1)])

import itertools

for i in itertools.count(1,1): # 1부터 시작하여 1씩 증가 하는 카운터
    print(i)
    if i>10 :
        break

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k=itertools.count(1)

print(k)

  count(1)

print(k)

  count(1)

k

  count(1)

print(iter(k),iter(k))

  count(1) count(1)

iter(k)

  count(1)