Python - 尝试获取特定单词作为输出但收到错误

Question

尝试将技能作为模式进行匹配并应用 groupby 函数，但接收为不可散列的列表。

Tec_skills=['MS SQL Server', 'Oracle','Machine Learning', 'Artificial Intelligence', 'Deep Neural Networks', 
        'Convolutional Neural Network', 'Sklearn Libraries', 'Keras','Tensor flow', 'SQL', 'C#','NoSQL',' Docker',
       'Python','Shell','SQL/PLSQL','PLSQL','R','C','C++','AWS','Neural Networks,','CNN','RNN','Linear/Logistic Regression', 
        'Ensemble Trees, Gradient','Boosted trees, Bagging, Random forest','Time series','Data Visualization','Sentiment Analysis',
       'Docker & Kubernetes','Classification','clustering','supervised','unsupervised']
def tech_skills(text):
    word_tokens=word_tokenize(text)
    filtered_stop_word = [word for word in word_tokens if word not in stopwords.words('english')]
    all_combinations=' '.join,everygrams(filtered_stop_word,2,3)
    #ext_skills=[]
    ext_skills=re.findall(Tec_skills,all_combinations)
    if ext_skills:
        return (ext_skills.group(0))
    return (ext_skills.group(0))

All_pdf_data_bygroup=All_pdf_data.groupby(All_pdf_data.index)


All_pdf_data_bygroup["text"].apply(lambda x: ' '.join(x)).apply(lambda x:tech_skills(x))

错误：类型错误：不可散列类型：“列表”

请建议如何解决该问题。