Implementing a subclass

Class MySub is a subclass of MyBase: 
class MySub(MyBase):

    def __init__(self,i,j,k):  # constructor
        MyBase.__init__(self,i,j)
        self.k = k;
 
   def write(self):
        print 'MySub: i=',self.i,'j=',self.j,'k=',self.k
Example: 
# this function works with any object that has a write method:
def write(v): v.write()

# make a MySub instance
inst2 = MySub(7,8,9)

write(inst2)   # will call MySub's write

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