cmd安装pip时出现问题：
WARNING: You are using pip version 21.1.3; however, version 22.0.4 is available.
You should consider upgrading via the ‘c:usersdellappdatalocalprogramspythonpython37python.exe -m pip install --upgrade pip’ command.
原因分析：
pip需要升级
解决方案：
输入：C:UsersDELLappdatalocalprogramspythonpython37python.exe -m pip install --upgrade pip
（根据自己的路径）
