将嵌套列表中的单词词形还原

问题描述

如何将嵌套列表中的单词词形还原成一行？我尝试了几件事，我越来越接近了，但我想我的语法可能有问题？我该如何解决？

from nltk.stem import WordNetLemmatizer 
lemmatizer = WordNetLemmatizer()
word_list = [['test','exams','projects'],['math','exam','things']]
word_list # type list

Try #1: Does the lemmatization but in different format
for word in word_list:
    for e in word: 
        print(lemmatizer.lemmatize(e)) # not the result I need for 

Try #2: Looking for similar approach in one line to solve the problem. Not giving correct results. 
[[word for word in lemmatizer.lemmatize(str(doc))] for doc in word_list]

Output needed: 

[['test','project'],'thing']]

解决方法

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