[Python-ideas] Statements vs Expressions... why?

[Greg Ewing]

Cliff Wells wrote:

> Actually, I think I see the issue.  join() is getting a list of
> iterators (using list notation for simplicity): 
> 
> '-'.join ( [ [ 's','p','a','m'], ['e','g','g','s'] ] )
> 
> Is this the conclusion you were coming to or something else?

Yes, that's right. Arnaud's original code is a single
generator containing two nested loops, whereas your
version consists of two nested generators.

I think your first translation would have produced
the right result, because it iterated over each of
the inner generators and re-yielded their results
in the outer generator. But that's a very expensive
way of going about it.

-- 
Greg