def sloj(x, y) 
s=x+y
print s

>>> def sloj(x, y)    File "<stdin>", line 1     def sloj(x, y)                    ^ SyntaxError: invalid syntax >>> s=x+y Traceback (most recent call last):   File "<stdin>", line 1, in <module> NameError: name 'x' is not defined >>> print s