了解pygod。
It is recommended to use pip for installation. Please make sure the latest version is installed, as PyGOD is updated frequently:

pip install pygod            # normal install
pip install --upgrade pygod  # or update if needed

如果pip不是最新的，可以使用下述命令检查并安装最新的pip。
pip install --upgrade pip。
使用pip version确认pip版本。