如何在python中将列表转换为字典

Question

我有以下列表:

pet = ['cat','dog','fish','cat','fish','fish']

我需要将它转换为这样的字典:

number_pets= {'cat':2, 'dog':1, 'fish':3}

我该怎么做？

Answer 1

用途collections.Counter:

>>> from collections import Counter
>>> pet = ['cat','dog','fish','cat','fish','fish']
>>> Counter(pet)
Counter({'fish': 3, 'cat': 2, 'dog': 1})