Python variable list of parameters

The number of parameters in a general computer language cannot be changed, but the number of arguments in Python can be changed. This is achieved primarily through *arg and **arg in formal parameters, and the following rules must be observed with variable arguments:

1. Position parameter must appear before this *arg parameter

2, *arg must appear before **arg, after *arg this and **arg before the parameter must be the keyword parameter

3,**arg parameters can not have any parameters, in addition.

4, *arg after collecting positional parameters, the non-keyword parameter is a meta-ancestor, and **arg collects the keyword parameter as a dictionary.

def Testone (x,*xx,y=21,z=2, * *yy)    :print(x,y,z,xx,yy)if__ name__= ='__main__':    testone (1, 2,4, z=22, y=22, k1=0)

Results: 1 (2, 4) {' K1 ': 0, ' K2 ': 1}

Splitting of parameter lists

arg=[1,3,5]print(*arg)

Results: 1 3 5

Python variable list of parameters