[2540]Python args 和 kwargs 及各参数的理解
(https://docs.python.org/3/tutorial/controlflow.html#more-on-defining-functions)
[理解 Python 中的 *args 和 **kwargs](http://kodango.com/variable-arguments-in-python)
# * 用于解包列表或元组，** 用于解包字典
> The reverse situation occurs when the arguments are already in a list or tuple but need to be unpacked for a function call requiring separate positional arguments. For instance, the built-in range() function expects separate start and stop arguments. If they are not available separately, write the function call with the *-operator to unpack the arguments out of a list or tuple:
> In the same fashion, dictionaries can deliver keyword arguments with the **-operator:
# *args 和 **kwargs 分别用于默认参数（Default Argument）和关键字参数（Keyword Arguments）
# 各种类型的参数
(https://blog.csdn.net/u014745194/article/details/70158926)
(http://treyhunner.com/2018/04/keyword-arguments-in-python/)
(https://www.python.org/dev/peps/pep-3102/)
## 必选参数，位置参数
positional
## 可选参数，默认参数
optional,default
## 关键字参数，命名参数
Keyword,named
## 可变参数
Arbitrary
## 命名关键字参数
Keyword-Only
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