*args和**kwargs

def func(*args):
    print(args,type(args))

func(1,2,3)
(1, 2, 3) <class 'tuple'>

func(1)
(1,) <class 'tuple'>

def func2(**kwargs):
    print(kwargs)

func2(a=2)

{'a': 2}

#参数arg、*args、**kwargs三个参数的位置必须是一定的。必须是(arg,*args,**kwargs)这个顺序，否则程序会报错
def function(arg,*args,**kwargs):
    print(arg,args,kwargs)

function(6,7,8,9,a=1, b=2, c=3)
6 (7, 8, 9) {'a': 1, 'b': 2, 'c': 3}