python使用技巧（二十五）：*args, **kwargs生成可变列表与字典

def func(*args, **kwargs):
    """
    *args用来表示函数接收可变长度的非关键字参数列表作为函数的输入
    **kwargs表示函数接收可变长度的关键字参数字典作为函数的输入**kwargs表示函数接收可变长度的关键字参数字典作为函数的输入
    """

    print(args)
    print(kwargs)
    print("------------------")

    return args
def test_args(normal_arg, *args):
    print("first normal arg:" + normal_arg)
    for arg in args:
        print("another arg through *args :" + arg)

def test_kwargs(**kwargs):
    if kwargs is not None:
        for key, value in kwargs.items():
            print("{} = {}".format(key,value))
        # Or you can visit kwargs like a dict() object
        # for key in kwargs:
        #    print("{} = {}".format(key, kwargs[key]))




if __name__ == "__main__":
    func()
    func(1, 2, 3, 4)
    func(A=1, B=2, C=3)
    func("python", 123, A=1, B=2, C=3)
    list1 = [1,2,3]
    list2 = [3,5,6]
    list3 = [9,10]
    # func(list1)
    func(list1,list2)
    print("func1--->",list(func(list1,list2,list3)))
    print("func2--->", func(list1, list2, list3))

    test_args("normal", "python", "java", "C#")
    test_kwargs(name="python", value="5")

生成结果：

()
{}
------------------
(1, 2, 3, 4)
{}
------------------
()
{'A': 1, 'B': 2, 'C': 3}
------------------
('python', 123)
{'A': 1, 'B': 2, 'C': 3}
------------------
([1, 2, 3], [3, 5, 6])
{}
------------------
([1, 2, 3], [3, 5, 6], [9, 10])
{}
------------------
func1---> [[1, 2, 3], [3, 5, 6], [9, 10]]
([1, 2, 3], [3, 5, 6], [9, 10])
{}
------------------
func2---> ([1, 2, 3], [3, 5, 6], [9, 10])
first normal arg:normal
another arg through *args :python
another arg through *args :java
another arg through *args :C#
name = python
value = 5