如何修复导入错误：在Python不能导入名称“format_exception_only”

Question

我使用pycharm社区版为3.6.1的Python作为我初学当我试图运行简单的记号化程序 -

import nltk 
from nltk.tokenize import word_tokenize 
word_tokenize(" hellow world im nltk") 

我得到出现以下错误 -

C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\python.exe E:/test/token.py 
Traceback (most recent call last): 
    File "E:/test/token.py", line 1, in <module> 
    import nltk 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nltk\__init__.py", line 89, in <module> 
    from nltk.internals import config_java 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nltk\internals.py", line 11, in <module> 
    import subprocess 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\subprocess.py", line 126, in <module> 
    import threading 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\threading.py", line 7, in <module> 
    from traceback import format_exc as _format_exc 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\traceback.py", line 5, in <module> 
    import linecache 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\linecache.py", line 11, in <module> 
    import tokenize 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\tokenize.py", line 35, in <module> 
    from token import * 
    File "E:\test\token.py", line 2, in <module> 
    from nltk.tokenize import word_tokenize 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nltk\tokenize\__init__.py", line 64, in <module> 
    from nltk.tokenize.mwe  import MWETokenizer 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nltk\tokenize\mwe.py", line 31, in <module> 
    from nltk.util import Trie 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nltk\util.py", line 13, in <module> 
    import pydoc 
    File "C:\Users\Amnaa\AppData\Local\Programs\Python\Python36-32\lib\pydoc.py", line 72, in <module> 
    from traceback import format_exception_only 
ImportError: cannot import name 'format_exception_only' 

Process finished with exit code 1 

Answer 1

转到命令提示符（不一定是命令提示符，也可以从IDLE执行它）。在python解释器中执行nltk.download()，然后下载all-corpora和book。完成此操作后，运行您的程序。它应该工作。

Answer 2

File "E:\test\token.py", line 2, in from nltk.tokenize import word_tokenize

碰巧有另一个脚本与Python正在寻找同名。 Python对包中的脚本和自己的脚本感到困惑，因为它从您所在的文件夹开始搜索。 所以，只需将您自己的脚本更改为其他名称即可。