一、日志信息

^.^ pip3 install pytest
Traceback (most recent call last):
  File "d:\python3.9.2\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "d:\python3.9.2\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "D:\python3.9.2\Scripts\pip3.exe\__main__.py", line 4, in <module>
ModuleNotFoundError: No module named 'pip'

关键信息：ModuleNotFoundError: No module named 'pip’

二、原因

可能是新旧版本冲突。

三、解决方案

方案1

1）python -m ensurepip
2）python -m pip install --upgrade pip

方案2

sudo apt install --fix-missing python3-pip

方案3

1）curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
2）python3 get-pip.py --force-reinstall