This is rather confusing:

Python 2.6.4 (r264:75706, Mar  8 2010, 08:41:55)
[GCC 4.3.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket, asyncore
>>> class T:
...     pass
...
>>> t = T()
>>> print t
<__main__.T instance at 0x18237a0>
>>> print repr(t)
<__main__.T instance at 0x18237a0>
>>> class A(asyncore.dispatcher):
...     pass
...
>>> a = A()
>>> print a
None
>>> print repr(a)
<__main__.A at 0x179c0e0>
>>> class B(asyncore.dispatcher):
...     def __init__(self, *args):
...             asyncore.dispatcher.__init__(self, *args)
...
>>> sock = socket.socket()
>>> b = B(sock)
>>> print b
<socket._socketobject object at 0x7fcef226e8a0>
>>> print repr(b)
<__main__.B at 0x179c0e0>

Here's dispatcher's __repr__:

    def __repr__(self):
        status = [self.__class__.__module__+"."+self.__class__.__name__]
        if self.accepting and self.addr:
            status.append('listening')
        elif self.connected:
            status.append('connected')
        if self.addr is not None:
            try:
                status.append('%s:%d' % self.addr)
            except TypeError:
                status.append(repr(self.addr))
        return '<%s at %#x>' % (' '.join(status), id(self))

Which doesn't seem excessively complex...