NLTK python error: "TypeError: 'dict_keys' object is not subscriptable"
PythonPython 3.xDictionaryKeyNltkPython Problem Overview
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.
Here's the last part of the code:
fdist1 = FreqDist(NSmyText)
vocab=fdist1.keys()
vocab[:200]
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
Any suggestions on how to fix this so it can correctly return an answer?
Python Solutions
Solution 1 - Python
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())
Solution 2 - Python
I am using python 3.5 and I meet the same problem of TypeError.
Using vocab = list(fdist1.keys()) does not give me the top 50 most frequently used words.
But fdist1.most_common(50) does.
Further,if you just want to show those top 50 words not with their frequency,you can try :
[word for (word, freq) in fdist1.most_common(50)]
Solution 3 - Python
To print the most frequently used 200 words use: fdist1.most_common(200) The above line of code will return the 200 most frequently used words as key-frequency pair.
Solution 4 - Python
If you want to get elements as keys and values (word and frequency), you can use:
list(fdist1.items())[:200]
Solution 5 - Python
If your using python 3 try:
fdist1.most_common(200)
instead, to get the 200 most frequent words.
Solution 6 - Python
fdist1 = FreqDist(NSmyText)
vocab=fdist1.keys()
This code is using in Python2.7. So you should do some change. dic.keys() returns an iteratable. So using:
list(fdist1.keys())