``
import collections
list1 = ['a', 'b', 'b', 'b', 'a']
dict1 = collections.Counter(list1)
print(dict(dict1))
# 结果是 {'a': 2, 'b': 3}
``
import collections
list1 = ['a', 'b', 'b', 'b', 'a']
dict1 = collections.Counter(list1)
print(dict(dict1))
# 结果是 {'a': 2, 'b': 3}