Method __add__

Lib/test/test_descr.py:3600–3601

(self, other)

            def __repr__(self):
                return "I(%r)" % int(self)
            def __add__(self, other):
                return I(int(self) + int(other))
            __radd__ = __add__
            def __pow__(self, other, mod=None):
                if mod is None: