无法启动 Python，导入错误答案

【问题标题】：Can't start Python, import error无法启动 Python，导入错误
【发布时间】：2018-05-29 14:42:46
【问题描述】：

昨天我安装了mysql连接器包，今天我无法启动python了。 Anacona 不会启动，也不会直接启动 Python 3.6。 Anaconda 提示已交付：

Microsoft Windows [Version 10.0.17134.48]
(c) 2018 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\ric22>python.exe -m idlelib.idle
Error processing line 1 of C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site-packages\protobuf-3.5.2.post1-py3.6-nspkg.pth:
Failed to import the site module
Traceback (most recent call last):
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 168, in addpackage
    exec(line)
  File "<string>", line 1, in <module>
  File "D:\Programme\Anaconda\pkgs\sqlalchemy-1.1.13-py36h5948d12_0\Lib\site-packages\sqlalchemy\dialects\mysql\types.py", line 9, in <module>
    from ... import exc, util
ImportError: attempted relative import with no known parent package

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 544, in <module>
    main()
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 531, in main
    known_paths = addsitepackages(known_paths)
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 328, in addsitepackages
    addsitedir(sitedir, known_paths)
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 207, in addsitedir
    addpackage(sitedir, name, known_paths)
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\site.py", line 178, in addpackage
    import traceback
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\traceback.py", line 5, in <module>
    import linecache
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\linecache.py", line 8, in <module>
    import functools
  File "C:\Users\ric22\AppData\Local\Programs\Python\Python36\lib\functools.py", line 22, in <module>
    from types import MappingProxyType
  File "D:\Programme\Anaconda\pkgs\sqlalchemy-1.1.13-py36h5948d12_0\Lib\site-packages\sqlalchemy\dialects\mysql\types.py", line 9, in <module>
    from ... import exc, util
ImportError: attempted relative import with no known parent package

有人知道如何让 Python 再次运行吗？提前致谢

瑞克

【问题讨论】：

您似乎缺少环境变量PYTHONPATH，它应该包含一个分隔的路径列表，python 在其中查找其依赖项，很像 Java 中的CLASSPATH 或PATH几乎任何操作系统中的可执行文件。例如。 `D:\Programme\Anaconda\pkgs` 应该在 PYTHONPATH 中

标签： python environment-variables anaconda

【解决方案1】：

感谢两栖，

我已经设置了这个环境变量，因为我无法让 mysql 包在 Spyder 上工作：
D:\Programme\Anaconda\pkgs\sqlalchemy-1.1.13-py36h5948d12_0\Lib\site-packages\sqlalchemy\dialects\mysql\types.py
（现在我看到 .py 显然没有文件夹；））这把一切都搞砸了。我删除了它并安装了这个包 conda install mysql-connector-python 输入 conda 路径。现在一切正常。

【讨论】：