>>> def f(x, y, z):  
    return x + y + z  
  
>>> args = (1,2,3)  
>>> print f(args)  
  
Traceback (most recent call last):  
  File "<pyshell#6>", line 1, in <module>  
    print f(args)  
TypeError: f() takes exactly 3 arguments (1 given)

>>> f(*args)