python - 如何从字典中构造一个 defaultdict？

Question

如果我有 d=dict(zip(range(1,10),range(50,61))) 我该如何构建 collections.defaultdict dict 的？

defaultdict 唯一的参数似乎是工厂函数，我是否必须初始化然后通过原始 d 并更新 defaultdict?

Answer 1

Read the docs :

The first argument provides the initial value for the default_factory attribute; it defaults to None. All remaining arguments are treated the same as if they were passed to the dict constructor, including keyword arguments.

from collections import defaultdict
d=defaultdict(int, zip(range(1,10),range(50,61)))

或者给定一个字典d:

from collections import defaultdict
d=dict(zip(range(1,10),range(50,61)))
my_default_dict = defaultdict(int,d)