一、

WARNING: You are using pip version 21.0.1; however, version 21.1 is available.

You should consider upgrading via the 'd:\programfiles\ddproject1\venv\scripts\python.exe -m pip install --upgrade pip' command.

解决方法：使用  pip install -U pip 更新    

查看版本pip --version

二、ERROR: Could not install packages due to an OSError: [WinError 5] 拒绝访问。: 'd:\\programfiles\\ddproject1\\venv\\scripts\\pip.exe'Consider using the `--user` option or check the permissions.

解决方法

将pip install ...加入--user为pip install --user ...即可

如果还是有问题，可以以管理员权限运行cmd再输入上述命令行试试~

三、解决ModuleNotFoundError: No module named 'pip'问题

python -m ensurepip

python -m pip install --upgrade pip    #更新