Python 使用nltk停止字从列中的列表中删除停止字时，删除停止字失败

我有一个带有字符串条目的数据框，我正在使用一个函数删除停止字。单元格已编译，但未生成预期结果

df['column'].iloc[0] = 'BK HE HAS KITCHEN TROUBLE WITH HIS BLENDER'

def text_process(text):
    try :
        nopunc = [char for char in text if char not in sting.punctuation]
        nopunc = ' '.join(nopunc)
        return [word for word in nopunc.split() if word.lower not in stopwords.words('english')
    except TypeError: return []

df['column'].apply(text_process)

The first cell results look like this : 
['BK ', 'HE', 'HAS', 'KITCHEN', 'TROUBLE', 'WITH', 'HIS', 'BLENDER']

（他，已经，和他的）应该被移除，但他们仍然出现在牢房里？有人能解释一下这是怎么发生的，或者如何修复它吗

from nltk.corpus import stopwords 
from nltk.tokenize import word_tokenize 

example_sent = "BK HE HAS KITCHEN TROUBLE WITH HIS BLENDER"
example_sent=example_sent.lower()
stop_words = set(stopwords.words('english')) 

word_tokens = word_tokenize(example_sent) 

filtered_sentence = [w for w in word_tokens if not w in stop_words] 

filtered_sentence = [] 

for w in word_tokens: 
    if w not in stop_words: 
       filtered_sentence.append(w) 


print(word_tokens) 
print(filtered_sentence) 

['bk'，'he'，'has'，'kitchen'，'trouble'，'with'，'his'，'blender']

['bk'，'kitchen'，'trouble'，'blender']

['bk'，'he'，'has'，'kitchen'，'trouble'，'with'，'his'，'blender']

['bk'，'kitchen'，'trouble'，'blender']