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An object subclass for Python 2 that gives new-style classes written in the
style of Python 3 (with ``__next__`` and unicode-returning ``__str__`` methods)
the appropriate Python 2-style ``next`` and ``__unicode__`` methods for compatible.

Example use::

    from builtins import object

    my_unicode_str = u'Unicode string: \u5b54\u5b50'

    class A(object):
        def __str__(self):
            return my_unicode_str

    a = A()
    print(str(a))

    # On Python 2, these relations hold:
    assert unicode(a) == my_unicode_string
    assert str(a) == my_unicode_string.encode('utf-8')


Another example::

    from builtins import object

    class Upper(object):
        def __init__(self, iterable):
            self._iter = iter(iterable)
        def __next__(self):                 # note the Py3 interface
            return next(self._iter).upper()
        def __iter__(self):
            return self

    assert list(Upper('hello')) == list('HELLO')

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        next
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        __nonzero__

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    __str__, and __bool__).
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