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__radd__ Handles Right-Side Addition

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 x + y                           # __add__: instance + instance