解决'python -m pip install --upgrade pip' 报错问题

再安装包的时候提示

You are using pip version 9.0.3, however version 10.0.1 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command.

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而我按照要求运行python -m pip install --upgrade pip 后仍然无法成功升级，提示如下：

(venv) D:\Fish>python -m pip install --upgrade pip

Requirement already up-to-date: pip in d:\fish\venv\lib\site-packages (10.0.1)

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于是按照要求将d:\fish\venv\lib\site-packages (10.0.1) 中的pip-10.0.1.dist-info删除，再次运行python -m pip install --upgrade pip 后升级成功，之前不能安装的包也能安装了！

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