>pip list
...
WARNING: You are using pip version 20.3.3; however, version 21.0 is available.
You should consider upgrading via the 'c:\python39\python.exe -m pip install --upgrade pip' command.
>py -m pip install --upgrade pip
Requirement already satisfied: pip in c:\python39\lib\site-packages (20.3.3)
Collecting pip
  Downloading pip-21.0-py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.3.3
    Uninstalling pip-20.3.3:
ERROR: Could not install packages due to an EnvironmentError: [WinError 5] �������� � �������: 'c:\\python39\\scripts\\pip.exe'
Consider using the `--user` option or check the permissions.
>pip
C:\Python39\python.exe: No module named pip