[Python-ideas] Where-statement (Proposal for function expressions)

[Daniel Stutzbach]

On Thu, Jul 16, 2009 at 10:06 AM, Paul Moore <p.f.moore at gmail.com> wrote:

> x[i] = 12 where:
>    i = some_complicated_expression()
>
> Was that deliberate? If so, could you explain why now, so that it's on
> record for the legions of people who will ask after it's implemented?
> :-)


Because only the right-hand side is in the where-block's scope.  If the
left-hand side were in the where-block's scope, then:

x = 0
x = i where:
   i = 5
print x

Would print "0" not "5".

--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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