Class Python

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class Commuter:
     def __init__(self, val):
         self.val = val
     def __add__(self, other):
         print 'add', self.val, other
     def __radd__(self, other):
         print 'radd', self.val, other
x = Commuter(88)
y = Commuter(99)
x + 1                      # __add__:  instance + noninstance
1 + y                      # __radd__: noninstance + instance
print x + y                # __add__:  instance + instance