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[Python-Dev] accumulator display syntax

Barry Warsaw barry at python.org
Tue Oct 21 18:07:22 EDT 2003 
On Tue, 2003-10-21 at 17:59, Raymond Hettinger wrote:
> [Guido]
> > I expect that most iterator comprehensions (we need a better term!)
> > are not stored in a variable but passed as an argument to something
> > that takes an iterable, e.g.
> > 
> >   sum(len(line) for line in file if line.strip())
> 
> That is somewhat beautiful.

Indeed, as is the term "generator expression" and the relegation to
syntactic sugar of list comprehensions.

> > We can quibble about whether double parentheses are needed
> 
> I vote for not requiring the outer parentheses unless there is an
> adjacent comma.

I like that too.  It mirrors other situations where the parentheses
aren't needed except to disambiguate syntax.  In the above example,
there's no ambiguity.

-Barry

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