python - 使用 pip3 : ModuleNotFoundError: No module named 'pip._vendor.packaging.__about__' 时出现错误

Question

每当我尝试使用 pip3 或任何包含 pip3 的东西时，我都会收到以下错误:

ModuleNotFoundError: No module named 'pip._vendor.packaging.__about__' pops up.

我用它安装了opencv，昨天在多个项目中使用了opencv。我不知道为什么今天会弹出错误。

这是我的代码:

kaushiksankar@Kaushiks-MacBook-Pro ~ % pip3 install opencv-python
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/bin/pip3", line 5, in <module>
    from pip._internal.cli.main import main
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/cli/main.py", line 10, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/cli/cmdoptions.py", line 23, in <module>
    from pip._internal.cli.progress_bars import BAR_TYPES
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/cli/progress_bars.py", line 12, in <module>
    from pip._internal.utils.logging import get_indentation
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/utils/logging.py", line 17, in <module>
    from pip._internal.utils.deprecation import DEPRECATION_MSG_PREFIX
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_internal/utils/deprecation.py", line 13, in <module>
    from pip._vendor.packaging.version import parse
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pip/_vendor/packaging/__init__.py", line 6, in <module>
    from .__about__ import (
ModuleNotFoundError: No module named 'pip._vendor.packaging.__about__'

我正在使用 MacOS。

我无法通过任何方法找到 pip 的版本。pip 命令无法使用，因此使用了 pip3。

Answer 1

下载get-pip.py文件并将其存放在安装python的同一目录下。或者使用下面的命令直接下载pip，

wget https://bootstrap.pypa.io/get-pip.py

现在使用下面的命令执行下载的文件:

python3 get-pip.py

可以通过执行版本检查轻松验证 pip 是否已正确安装。只需转到命令行并执行以下命令:

pip3 --version

之后，您可以安装您的包:

pip3 install package_name