好吧，我正在阅读《 O'reilly nlp》这本书，其中指定使用包中的函数，但它不一定能正常工作。
代码：
babe_shell() // specified in book
错误是：
>>> from nltk.book import*
*** Introductory Examples for the NLTK Book ***
Loading text1, ..., text9 and sent1, ..., sent9
Type the name of the text or sentence to view it.
Type: 'texts()' or 'sents()' to list the materials.
text1: Moby Dick by Herman Melville 1851
text2: Sense and Sensibility by Jane Austen 1811
text3: The Book of Genesis
text4: Inaugural Address Corpus
text5: Chat Corpus
text6: Monty Python and the Holy Grail
text7: Wall Street Journal
text8: Personals Corpus
text9: The Man Who Was Thursday by G . K . Chesterton 1908
>>> babelize_shell()
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
babelize_shell()
NameError: name 'babelize_shell' is not defined