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

使用pip3安裝軟件時報如下錯誤：
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the ‘pip install –upgrade pip’ command.

解決辦法：
升級pip3：pip3 install –upgrade pip