1. 在用pip下载requests 提示pip版本太旧需要升级
2.输入 python -m pip install -U pip
错误提示:You are using pip version 9.0.1, however version 19.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
3.输入 python -m pip install --upgrade pip
还出现同样错误提示
4. 没办法,卸载pip:https://pypi.org/project/pip/#files下载压缩文件解压后
python setup.py install
5.查看pip: pip show pip
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