相关疑难解决方法(0)

我什么时候使用？

另外...... NLTK的词形还原取决于词性？如果它是不是更准确？

我想提取这样的词：

a dog ==> dog
some dogs ==> dog
dogmatic ==> None

有一个类似的链接： 从pandas DataFrame中的文本中提取子字符串作为新列

但这不能满足我的要求。

从此数据帧：

df = pd.DataFrame({'comment': ['A likes cat', 'B likes Cats',
                               'C likes cats.', 'D likes cat!', 
                               'E is educated',
                              'F is catholic',
                              'G likes cat, he has three of them.',
                              'H likes cat; he has four of them.',
                              'I adore !!cats!!',
                              'x is dogmatic',
                              'x is eating hotdogs.',
                              'x likes dogs, he has three of them.',
                              'x likes dogs; he has four of them.', …