TypeError:"dict_keys"对象不支持索引 [英] TypeError: 'dict_keys' object does not support indexing

问题描述

def shuffle(self, x, random=None, int=int):
    """x, random=random.random -> shuffle list x in place; return None.

    Optional arg random is a 0-argument function returning a random
    float in [0.0, 1.0); by default, the standard random.random.
    """

    randbelow = self._randbelow
    for i in reversed(range(1, len(x))):
        # pick an element in x[:i+1] with which to exchange x[i]
        j = randbelow(i+1) if random is None else int(random() * (i+1))
        x[i], x[j] = x[j], x[i]

当我运行shuffle函数时，它会引发以下错误，为什么?

When I run the shuffle function it raises the following error, why is that?

TypeError: 'dict_keys' object does not support indexing

推荐答案

很显然，您要将d.keys()传递给了shuffle函数.可能是用python2.x编写的(d.keys()返回列表时).使用python3.x，d.keys()返回一个dict_keys对象，该对象的行为与list相比更像set.因此，无法对其进行索引.

Clearly you're passing in d.keys() to your shuffle function. Probably this was written with python2.x (when d.keys() returned a list). With python3.x, d.keys() returns a dict_keys object which behaves a lot more like a set than a list. As such, it can't be indexed.

解决方案是将list(d.keys())(或简称为list(d))传递给shuffle.

The solution is to pass list(d.keys()) (or simply list(d)) to shuffle.

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