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

Greg Ewing greg.ewing at canterbury.ac.nz
Tue Sep 16 07:58:50 CEST 2008

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.


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