>>> def printname(firstname,  lastname):
...     print firstname + "  " + lastname
>>> printname("Jim", "Knowlton")
Jim  Knowlton
>>> printname("Bob")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: printname() takes exactly 2 arguments (1 given)
>>> printname("William", "Jennings", "Bryan")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: printname() takes exactly 2 arguments (3 given)
>>>