ubuntu16.04 更新pip

You are using pip version 9.0.3, however version 10.0.0 is available.

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

当我们用pip安装python包的时候 会发现pip 又又又又又又又又又又又又又又又又又又更新了

于是，我们按照提示

pip install --upgrade pip

可能会发现这个不行，搞不定。不妨试试如下命令：

sudo -H python -m pip install --upgrade pip