python collections.defaultdict（）编译错误 [英] python collections.defaultdict() compile error

问题描述

以下代码简单明了，编译时会产生错误：

The following code, simple and clear enough, produces an error when compiled:

import string
import collections

#create dictionary with alphabets as keys, and empty values
list = ['aema', 'airplane', 'amend']

gen_dict = dict.fromkeys(string.ascii_lowercase, '')

gen_dict = collections.defaultdict(list)

for x in list:
    gen_dict['a'].append(x)

，产生的错误是：

Traceback (most recent call last):
  File "indexdict.py", line 14, in <module>
    gen_dict = collections.defaultdict(list)
TypeError: first argument must be callable

<任何想法？
提前感谢

any idea? thanks in advance

推荐答案

您覆盖内部列表作为一种类型的名称，您的 list = ['aema'，'airplane'，'revision'] 。将列表重命名为 键或 keylist ，一切都会很好。

you overwrite the internal list, being the name of a type, with your list = ['aema', 'airplane', 'amend'] above. Rename your list to e.g. keys or keylist and all will be fine.

所以更换

list = ['aema', 'airplane', 'amend']

与

keys = ['aema', 'airplane', 'amend']

和

for x in list:

with

for x in keys:

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