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