dictionary를 만드는 방법들

dict.fromkeys(keys, value)

x = ('key1', 'key2', 'key3')
y = 0
dict.fromkeys(x,y)  
{'key1': 0, 'key2': 0, 'key3': 0}


x = ('key1', 'key2', 'key3') 
dict.fromkeys(x)
{'key1': None, 'key2': None, 'key3': None}

Counter()

from collections import Counter
Counter(['a','b','c','a','b','a'])

Counter({'a': 3, 'b': 2, 'c': 1})