*args **kwargs
MetPy Mondays
`#104 - What is *args? : Unidata Developer's Blog
https://www.unidata.ucar.edu/blogs/developer/entry/metpy-mondays-104-what-is
MetPy Mondays
`#105 - What is **kwargs? : Unidata Developer's Blog
https://www.unidata.ucar.edu/blogs/developer/entry/metpy-mondays-105-what-is
*args and **kwargs — Python Tips 0.1 documentation
http://book.pythontips.com/en/latest/args_and_kwargs.html
Pythonの可変長引数 *args **kwargs について調べてみた - Qiita
https://qiita.com/tomopiro/items/0266a1adf7483cdd94c4