导入错误：无法从“pip._internal.exceptions”导入名称“InvalidSchemeCombination”

Question

我对编程很陌生，所以如果我出错了，请不要生气。我将 pip 更新为最新版本（类似于 21.xx），并尝试安装 Detectron2 Git 存储库。但是任何与 pip 相关的东西（即使在检查它的版本时）我得到以下回溯：

Traceback (most recent call last):
  File "/Users/user/opt/anaconda3/bin/pip", line 7, in <module>
    from pip._internal.cli.main import main
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/main.py", line 8, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/cmdoptions.py", line 22, in <module>
    from pip._internal.cli.progress_bars import BAR_TYPES
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/cli/progress_bars.py", line 9, in <module>
    from pip._internal.utils.logging import get_indentation
  File "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/utils/logging.py", line 14, in <module>
    from pip._internal.utils.misc import ensure_dir
  File "/Users/user/opt/anaconda3/lib/python3.8/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 "/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/locations/__init__.py", line 9, in <module>
    from . import _distutils, _sysconfig
  File "/Users/user/opt/anaconda3/lib/python3.8/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' (/Users/user/opt/anaconda3/lib/python3.8/site-packages/pip/_internal/exceptions.py)

我的问题有解决方案吗？我也尝试降级到早期版本，但正如我所说，任何带有 pip 的评论都会给我这个回溯......

如果有人可以帮助我，我将不胜感激！

Answer 1

升级到 pip 20.xx 后我遇到了同样的错误，github( https://github.com/pypa/pip/issues/5599 )上有一个解决方案，它帮助我理解了问题，但没有帮助我。所以让我们来解决

解决方案

1. 手动删除或删除pip文件，并pip-20.2.4-py3.7.egg-info从目录，这在你的情况下位于文件/Users/user/opt/anaconda3/lib/python3.7/site-packages和一些它在/home/sawan/anaconda3/lib/python3.7/site-packages。

2.现在使用conda remove --force pip从您的系统中完全删除pip。

3. 最后用于conda install -c anaconda pip在您的 anaconda 环境中安装 pip。

对我来说它有效，希望它也适用于你

祝你好运