[Tutor] Instantiate a subClass using an instance of its baseClass

[Kenny Li]

Kent:

Overriding the accept() is an excellent idea. It looks more elegant than my
original thinking of "total" subclassing.
Thanks a lot; I have learned a great deal from you.

Kenny



On 2/13/06, Kent Johnson <kent37 at tds.net> wrote:
>
> Kenny Li wrote:
> > Yep! I think that is what I want. I did not know enough to do (inside
> > C.__init__() ):
> >         arg1.__class__=C
> >
> > As to my intent, I want to subclass socket.socket. By doing so, I may
> > get a socket (instance of my baseClass) after it (my subclass) accepts
> > an incoming connection, and I want to use the subclass instance (the
> > client socket) to get an instance of my subclass.
> >
> > Do you think your solution would work in my socket.socket subclassing
> > case? (I will give it a try to verify, just asking before I even try)
>
> I think so :-) unless some socket code is looking at the actual class of
> the socket.
>
> But why not just override socket.accept() to do what you want? Here is
> the full def of socket.accept():
>
>     def accept(self):
>         sock, addr = self._sock.accept()
>         return _socketobject(_sock=sock), addr
>
> Just change it to
>
>     def accept(self):
>         sock, addr = self._sock.accept()
>         return MySocket(_sock=sock), addr
>
> > Again, Thanks a lot, Kent!
> >
> > PS: there is information about __new__(), but there seems not a lot
> > about __class__, could you point me to some web sources about __class__?
>
> Google "site:docs.python.org __class__" and especially
> http://docs.python.org/dev/lib/specialattrs.html
>
> Kent
>
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