[Python-Dev] PEP 340 -- loose ends

[Eric Nieuwland]

I've been away for a while and just read through the PEP 340 discussion 
with growing amazement.

Pierre Barbier de Reuille wrote:
> As far as I understand it,
> iterator-for-blocks and iterator-for-loops are two different beasts.
Right!

> To try being as clear as possible, I would say the iterator-for-loops
> are simplified iterator-for-blocks. IOW, if I were to put them in a
> class inheritance hierarchy (I don't say we should put them into one ;)
> ) iterator-for-block would be the base class of iterator-for-loop. 
> Thus,
> as for-loops require an iterator-for-loop, they would raise an error if
> used with an iterator-for-block. But as blocks require an
> iterator-for-blocks they will allow iterator-for-loops too !
IMHO It is more like round holes and square pegs (or the other way 
around).

What PEP 340 seems to be trying to achieve is a generic mechanism to 
define templates with holes/place holders for blocks of code. That 
gives two nouns ('template' and 'code block') that both qualify as 
indicators of reusable items.

We can use standard functions as reusable code blocks. Wouldn't a 
template then be just a function that takes other functions ar 
arguments? All information transfer between the template and its 
arguments is via the parameter list/returned values.

What am I missing?

--eric