will python 3000 break my code?

[Alex]

> I wouldn't worry about that.  You won't have to throw or rewrite old
> code, unless you want to take advantage of features in Python 3000.

It wouldn't suprise me if some rewriting were needed.  For instance,
Guido said that he will be changing the list.append method so that
l.append(1,2) gives a syntax error.  That will mean that I am going to
have to change a hundred or so lines of code.  

Alex.