Is isinstance always "considered harmful"?

[Jordan Rastrick]

Thanks for the replies, everyone. As is usual when reading
comp.lang.python, I got some invaluable exposure to new ideas (multiple
dispatching in particular seems to fill a gap I've felt in OO
programming in the past.)

I'm starting to think this newsgroup is in its own right an excellent
reason to get into Python - the fact its an awesome language is just an
added bouns ;-)