降低pip到指定版本（通过cmp升级pip,在降低到原来版本）

升级到最新本版脚本：python -m pip install --upgrade pip
指定版本升降的脚本：python -m pip install pip==21.2.4（22.1.2）
查看本版的脚本：pip show pip

C:\Users\euweb>python -m pip install pip==21.2.4
Defaulting to user installation because normal site-packages is not writeable
Collecting pip==21.2.4
  Downloading pip-21.2.4-py3-none-any.whl (1.6 MB)
     ---------------------------------------- 1.6/1.6 MB 4.1 MB/s eta 0:00:00
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 22.1.2
    Uninstalling pip-22.1.2:
      Successfully uninstalled pip-22.1.2
  WARNING: The scripts pip.exe, pip3.10.exe and pip3.exe are installed in 'C:\Users\euweb\AppData\Roaming\Python\Python310\Scripts' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed pip-21.2.4

C:\Users\euweb>pip show pip
Name: pip
Version: 21.2.4
Summary: The PyPA recommended tool for installing Python packages.
Home-page: https://pip.pypa.io/
Author: The pip developers
Author-email: [email protected]
License: MIT
Location: c:\users\euweb\appdata\roaming\python\python310\site-packages
Requires:
Required-by: