An object which appears to respect the semantics described at http://akaptur.github.io/blog/2013/06/28/side-effecting-assignment/

gistfile1.py

import gc

class Foo(object):
    """Object which appears to take the name of the first reference name

    >>> Foo().name
    >>> f = Foo()
    >>> f.name
    'f'
    >>> g = f
    >>> g.name
    'f'
    """
    def __init__(self):
        self._name = None

    def __repr__(self):
        return '<Foo %s>' % self.name

    def set_name(self):
        if self._name is None:
            namespaces = [ref for ref in gc.get_referrers(self) if isinstance(ref, dict)]
            keys = [name for ns in namespaces for name, v in ns.iteritems() if v is self]
            if len(keys) > 1:
                print 'you caught me, I can\'t actually tell which was first'
                self._name = ' aka '.join(keys)
            elif len(keys) == 1:
                self._name = keys[0]

    @property
    def name(self):
        self.set_name()
        return self._name

if __name__ == '__main__':
    import doctest
    doctest.testmod()