NLTK python错误:"TypeError:'dict_keys'对象不可下标" [英] NLTK python error: "TypeError: 'dict_keys' object is not subscriptable"

问题描述

我正在按照课堂作业的说明进行操作，应该在文本文件中查找前200个最常用的单词.

I am following instructions for a class homework assignment and I am supposed to look up the top 200 most frequently used words in a text file.

这是代码的最后一部分:

Here's the last part of the code:

fdist1 = FreqDist(NSmyText)
vocab=fdist1.keys()
vocab[:200]

但是当我在vocab 200行之后按Enter键时，它将返回:

But when I press enter after the vocab 200 line, it returns:

 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'dict_keys' object is not subscriptable

关于如何解决此问题的任何建议，以便它可以正确返回答案?

Any suggestions on how to fix this so it can correctly return an answer?

推荐答案

好像您正在使用Python3.在Python 3中，dict.keys()返回一个可迭代但不可索引的对象.最简单(但效率不高)的解决方案是:

Looks like you are using Python 3. In Python 3 dict.keys() returns an iterable but not indexable object. The most simple (but not so efficient) solution would be:

vocab = list(fdist1.keys())

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