[python2.7版本] pip安装包 或者 pip升级pip版本出现此错误

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      File "/tmp/pip-build-vD3Ntt/pip/setup.py", line 7
        def read(rel_path: str) -> str:
                         ^
    SyntaxError: invalid syntax
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-vD3Ntt/pip/
You are using pip version 8.1.2, however version 21.2.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
 

解决办法

wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
python get-pip.py
pip install --upgrade setuptools