For review: PEP 308 - If-then-else expression

[Jp Calderone]

On Mon, Feb 10, 2003 at 02:32:41AM +0000, Andrew Koenig wrote:
> >> I don't follow.  What's an "instance method" as opposed to a "class
> >> method"? [in the context of the string join method]
> 
> Erik> I presume he means something like (with S as the sequence, D as the
> Erik> string delimiter)
> 
> Erik> 	str.join(S, D)
> 
> Erik> instead of
> 
> Erik> 	D.join(S)
> 
> Eh?  str.join(D, S) works just fine, as far as I can see.

  str.join(S, D) does not, though.

  I believe the original post was suggesting something along the lines of...

class str:
    ...
    def join(cls, sequence, delimeter):
        if not sequence: return cls()
        r = cls(sequence[0])
        for s in sequence[1:]:
            r = r + delimiter + cls(s)
        return r
    join = classmethod(join)


  which I also think would be better than "delimeter.join(sequence)".  But
as others have stated, it wouldn't have worked when string methods were
first introduced, and it's pretty much too late now.  C'est la vie.

  Jp

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