Python's *args and **kwargs

1. *args allows you to pass a variable number of parameter lists (tuples) of a non-key-value pair to a function.

>>>defAdd (*args): ...returnsum (args) ...>>> Add (1,2,3,4)10>>> A = (1,2,3,4)>>> Add (a)#error, equivalent to sum (((1,2,3,4),), adding tuple a to 0Traceback (most recent): File"<stdin>", Line 1,inch<module>File"<stdin>", Line 2,inchaddtypeerror:unsupported operand type (s) for+:'int'  and 'tuple'>>> Add (*a)10>>> sum ((1,2,3,4) ,) Traceback (most recent): File"<stdin>", Line 1,inch<module>typeerror:unsupported operand type (s) for+:'int'  and 'tuple'

2. **kwargs allows you to pass a variable number of parameter dictionaries for a key-value pair to a function.

def Add (* *Kwargs): ...      return sum (kwargs.values ()) ... >>> Add (a=1,b=2,c=3)6

Comprehensive:

>>>defF (arg,*args,**Kwargs): ...Print(ARG) ...Print(args) ...Print(Kwargs) ...>>> f (1,* (1,2,3,4), **{"a": 1,"b": 2,"C": 3})1(1, 2, 3, 4){'b': 2,'C': 3,'a': 1}>>> F (1,1,2,3,4,a=1,b=2,c=3) # As with the above effect 

When called

deffunc (a,b,c,d):Print(a,b,c,d) args= (1,2,3,4) func (*args)1,2,3,4deffunc (a,b,c,d):Print(a,b,c,d) Kargs= {'a': 1,'b': 2,'C': 3,'D': 4}func (**Kargs)1,2,3,4

Python's *args and **kwargs