'StreamReaderWriter' object is not subscriptable

Код:

import json
import pickle
import random
from codecs import StreamReaderWriter
from typing import Any, Union

import numpy as np

import nltk
from nltk.stem import WordNetLemmatizer

from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense, Activation, Dropout
from tensorflow.keras.optimizers import SGD

lemmatizer = WordNetLemmatizer

import codecs

intents: Union[StreamReaderWriter, Any]
with codecs.open('intents.json', encoding='utf-8') as intents:
    # intents = json.loads(open('intents.json').read())
    # for line in f:
    # print(line)
    words = []
    classes = []
    documents = []
ignore_letters = ['?', '!', '.', ',']

for intent in intents['intents']:
    for pattern in intent['patterns']:
        word_list = nltk.word_tokenize(pattern)
        words.append(word_list)
        documents.append((word_list, intent['tag']))
        if intent['tag'] not in classes:
            classes.append(intent['tag'])

words = [lemmatizer.lemmatize(word) for word in words if word not in ignore_letters]
words = sorted(set(words))

print(words)

Ошибка:

'StreamReaderWriter' object is not subscriptable

Как это исправить?