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/usr/lib/python3/dist-packages/simplegeneric.py is in python3-simplegeneric 0.8.1-1.

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__all__ = ["generic"]
try:
    from types import ClassType, InstanceType
    classtypes = type, ClassType
except ImportError:
    classtypes = type
    InstanceType = None

def generic(func):
    """Create a simple generic function"""

    _sentinel = object()

    def _by_class(*args, **kw):
        cls = args[0].__class__
        for t in type(cls.__name__, (cls,object), {}).__mro__:
            f = _gbt(t, _sentinel)
            if f is not _sentinel:
                return f(*args, **kw)
        else:
            return func(*args, **kw)

    _by_type = {object: func, InstanceType: _by_class}
    _gbt = _by_type.get

    def when_type(*types):
        """Decorator to add a method that will be called for the given types"""
        for t in types:
            if not isinstance(t, classtypes):
                raise TypeError(
                    "%r is not a type or class" % (t,)
                )
        def decorate(f):
            for t in types:
                if _by_type.setdefault(t,f) is not f:
                    raise TypeError(
                        "%r already has method for type %r" % (func, t)
                    )
            return f
        return decorate

    _by_object = {}
    _gbo = _by_object.get

    def when_object(*obs):
        """Decorator to add a method to be called for the given object(s)"""
        def decorate(f):
            for o in obs:
                if _by_object.setdefault(id(o), (o,f))[1] is not f:
                    raise TypeError(
                        "%r already has method for object %r" % (func, o)
                    )
            return f
        return decorate


    def dispatch(*args, **kw):
        f = _gbo(id(args[0]), _sentinel)
        if f is _sentinel:
            for t in type(args[0]).__mro__:
                f = _gbt(t, _sentinel)
                if f is not _sentinel:
                    return f(*args, **kw)
            else:
                return func(*args, **kw)
        else:
            return f[1](*args, **kw)

    dispatch.__name__       = func.__name__
    dispatch.__dict__       = func.__dict__.copy()
    dispatch.__doc__        = func.__doc__
    dispatch.__module__     = func.__module__

    dispatch.when_type = when_type
    dispatch.when_object = when_object
    dispatch.default = func
    dispatch.has_object = lambda o: id(o) in _by_object
    dispatch.has_type   = lambda t: t in _by_type
    return dispatch



def test_suite():
    import doctest
    return doctest.DocFileSuite(
        'README.txt',
        optionflags=doctest.ELLIPSIS|doctest.REPORT_ONLY_FIRST_FAILURE,
    )

if __name__=='__main__':
    import unittest
    r = unittest.TextTestRunner()
    r.run(test_suite())