具体文档参见:
Python语言规范:https://zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_language_rules/#id4
Python编码规范:https://zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_style_rules/
谷歌Python样式指南:https://google.github.io/styleguide/pyguide.html#21-lint
python位置参数:https://www.cnblogs.com/bingabcd/p/6671368.html