class Domin():
    def __init__(self , a, b) :
        self.a=a , self.b=b

    def where(self):
        print 'face : ' , self.a , "face : " ,self.b

    def value(self):
        print self.a + self.b

d1=Domin(1 , 5)   

d1=Domin(20 , 15)

Me sale este error:

Traceback (most recent call last):
  File "test2.py", line 13, in <module>
    d1=Domin(1 , 5)
  File "test2.py", line 5, in __init__
    self.a=a , self.b=b
TypeError: 'int' object is not iterable