[Tutor] class question

[Frank Holmes]

I have a question concerning one of the class examples given in O'Reilly's 
book "Learning Python"

   the following example is given:

>>>class adder:
       def __init__(self, value=0):
          self.data=value               #initialize data
       def __add__(self, other):
           self.data=self.data + other   #add other in-place
       def __repr__(self):
           return `self.data`          #convert to string
...
...
>>>x=adder(1)     #__init__
>>>x=2; x=2       #__add__
>>>x               #__repr__
5

   I am not understanding this at all. In assigning x=adder(1), self.data is 
given the value 1, right?
   x+2; x+2  should = 1+2; 1+2 ???
I am missing the point completely..... help



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