python - 虚拟环境中未找到模块错误

Question

我正在虚拟环境中开发一个项目，突然我收到了这个错误：

(env) D:\django3_by_example\env\Scripts>pip install markdown3.2.1
Traceback (most recent call last):
  File "c:\users\lenovo\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\lenovo\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "D:\django3_by_example\env\Scripts\pip3.exe\__main__.py", line 4, in <module>
ModuleNotFoundError: No module named 'pip'

到目前为止它工作正常，过了一会儿它给了我这个错误。我检查了“where pip”命令的路径，它告诉我它安装在虚拟环境中。