In article <mailman.923.1358979203.2939.python-l...@python.org>,
Chris Angelico <ros...@gmail.com> wrote:
> Personally, I'd much rather have a 'while' condition that does
> assignment, but that's something Python's unlikely ever to do.
> There've been various proposals to make that possible, but ultimately
> the only way to make that work is for assignment to be an expression,
> which is right up there alongside braces defining blocks.
while getchar() as c:
putchar(c)
That would give people (including me) the use case they're after most of
the time (call a function, assign the return value, and test it). It's
way less klunky than:
while True:
c = getchar()
if c:
break
putchar()
It wouldn't require assignment as an expression, or braces, or any new
keywords. It would also be quite analogous to
try:
blah()
except BogusThing as ex:
whatever()
in both cases, the effect is "perform some action, grab a value which
resulted from that, and if it passes some test, make it available in the
next block bound to a name".
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