first demo

demo1

def print_two(*args):
    arg1, arg2 = args
    print "arg1:%r, arg2: %r" %(arg1, arg2)

def print_two_again(arg1, arg2):
    print "arg1: %r, arg2: %r" %(arg1, arg2)

def print_one(arg1):
    print "arg1: %r" %arg1

def print_none():
    print "nada"

print_two("Cesar", "Lara")
print_two_again("Cesar", "Lara")
print_one("Cesar")
print_none