Inheriting frozenset gives bug if i overwrite __repr__ method

[srinivasan srinivas]

Hi,
I am getting an error while executing the following snippet. If i comment out method __repr__ , it works fine.

class fs(frozenset):
    def __new__(cls, *data):
        data = sorted(data)
        self = frozenset.__new__(cls, data)
        self.__data = data
        return self

    def __repr__(self):
        return "%s(%r)" % (self.__class__.__name__, self.__data)

a1 = fs(1,2,3)
a2 = fs(3,4,5)
print a1.difference(a2)

Error:
    return "%s(%r)" % (self.__class__.__name__, self.__data)
AttributeError: 'fs' object has no attribute '_fs__data'

Please help me in fixing this.

Thanks,
Srini



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