python - Python计算字典列表中的值

Question

假设我有这个字典列表：

c = [
    {"name": "Tom", "age": 10, "tag": "kid"},
    {"name": "Mark", "age": 35, "tag": "adult" },
    {"name": "Pam", "age": 70, "tag": "very old"},
    {"name": "Neo", "age": 16, "tag": "teenager"},
    {"name": "Anna", "age": 9, "tag": "kid"}
]

我想编写一个迭代列表c（并返回字典）的函数，以获取 的值tag在字典列表中出现的次数。在这种情况下，它应该返回一个像这样的字典：

f = {"kid": 2, "adult": 1, "very old": 1, "teenager": 1}

如何做到这一点？

标签： pythonlistdictionary

Answer 1

from collections import Counter
print(Counter(el["tag"] for el in c))

Counter({'kid': 2, 'adult': 1, 'very old': 1, 'teenager': 1})

Counter是的子类，dict可以像dict