python * args, ** kwargs parameters

In fact, the key is * and **

We have three examples to explain:

General parameters:

DEF test1 (Arg):
     Print (Arg) 
test1 ( " A " ) 
Output: 
A

* The remaining parameters is represented by Ganso

def test1(arg1,arg2,*args):
    print(arg1)
    print(arg2)
    print(args)
test1(1,2,3,"a","b")
输出：
1
2
(3, 'a', 'b')

** parameter is converted into dictionary indicates

DEF test2 (** kwargs):
     Print (kwargs) 
test2 (A =. 1, B = 2 ) 
Output: 
{ ' A ' :. 1, ' B ' : 2}

Finally, we must combine three ways :( Note that the order)

def test4(arg1,arg2,*args,**kwargs):
    print(arg1)
    print(arg2)
    print(args)
    print(kwargs)
test4(1,2,3,4,5,a=1,b=2)
输出：
1
2
(3, 4, 5)
{'a': 1, 'b': 2}