nltk停止字的for循環轉到無窮大

import nltk as nt

txt="The latest version of Anaconda comes with Python 3.8. But sometimes you need to use an earlier release. With Anaconda, the preferred way to use a previous version of Python is to create a separate conda environment for each project."

word_tok=nt.word_tokenize(txt)
stopWords=nt.corpus.stopwords.words("english")
print(word_tok)

wordClear=[]
for i in word_tok: # infinity loop
      if i not in stopWords:
        word_tok.append(i)

有什么問題？

我總是看到向上陳述的形式，但我的項目的這種形式是無限循環，但

for i in word_tok:
  print(i)

這不是無限循環。