当我尝试使用 pip 安装 python 模块时，会导致错误。 我该如何解决？

Question

我安装了 python 的最新版本。 我尝试安装名为 selenium 的 python 模块。 并且 pip 安装不起作用。 我该如何解决？ 我真的很想修复它错误消息如下

>pip install selenium

Traceback (most recent call last):
  File "c:\users\hym\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\hym\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\hym\AppData\Local\Programs\Python\Python39\Scripts\pip.exe\__main__.py", line 4, in <module>
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\main.py", line 8, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\cmdoptions.py", line 22, in <module>
    from pip._internal.cli.progress_bars import BAR_TYPES
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\cli\progress_bars.py", line 9, in <module>
    from pip._internal.utils.logging import get_indentation
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\utils\logging.py", line 14, in <module>
    from pip._internal.utils.misc import ensure_dir
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\utils\misc.py", line 29, in <module>
    from pip._internal.locations import get_major_minor_version, site_packages, user_site
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\locations\__init__.py", line 9, in <module>
    from . import _distutils, _sysconfig
  File "c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\locations\_sysconfig.py", line 8, in <module>
    from pip._internal.exceptions import InvalidSchemeCombination, UserInstallationInvalid
ImportError: cannot import name 'InvalidSchemeCombination' from 'pip._internal.exceptions' (c:\users\hym\appdata\local\programs\python\python39\lib\site-packages\pip\_internal\exceptions.py)

Answer 1

这个问题有两种解决方案：-

1. 您可以通过添加 -m 标志来使用此命令。 -m 标志代表模块名称，允许您在调用 Python 时传递模块。：-

   python -m pip 安装 selenium

2. 或者您可以根据您的要求直接从这里下载源代码分发，解压缩然后使用以下命令运行它：-

   python setup.py install