本文主要是介绍更新pip后出现WARNING：pip is being invoked by an old script wrapper，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
pip原始版本 9.0.1
tangzhe@tangzhe:~ pip --version
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
更新pip至最新版本
pip install --upgrade pip再查看pip版本时出现WARNING
tangzhe@tangzhe:~ pip --version
WARNING: pip is being invoked by an old script wrapper. This will fail in a future version of pip.
Please see https://github.com/pypa/pip/issues/5599 for advice on fixing the underlying issue.
To avoid this problem you can invoke Python with '-m pip' instead of running pip directly.
pip 21.3.1 from /home/tangzhe/.local/lib/python3.6/site-packages/pip (python 3.6)
提示内容显示，如果在pip前面加上"python -m "就不会出现警告，试了下，确实如此
tangzhe@tangzhe:~$ python -m pip --version
pip 21.3.1 from /home/tangzhe/.local/lib/python3.6/site-packages/pip (python 3.6)
但其实问题没有解决，而且这样很麻烦（当然也可以修改alias，让pip指向python -m pip）
在网上查了下，有建议通过"python -m "强制重新安装pip
python -m pip install --upgrade --force-reinstall pip但是我这边pip --version的时候还是会出现WARNING - -!
强制重新安装时也出现了WARNING，而且这个WARNING指出了问题！！！
WARNING: The scripts pip, pip3 and pip3.6 are installed in '/home/tangzhe/.local/bin' which is not on PATH.Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
将 '/home/tangzhe/.local/bin' 添加到 PATH 后就不会报错了。
* 其实一开始pip --version的两个路径就说明了问题
更新前的pip在 "/usr/lib/python3/dist-packages"， 更新后的pip在 "/home/tangzhe/.local/lib/python3.6/site-packages/pip"，而后一个路径并不在PATH里面！
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