[Python-ideas] Yield-from: Nonexistent throw() and close()?
Bruce Frederiksen
dangyogi at gmail.com
Sat Feb 21 14:47:36 CET 2009
Jacob Holm wrote:
> Greg Ewing wrote:
>> I'm happy to raise exceptions in the face of nonexistent
>> send() methods, but I'm not so sure about throw() and
>> close().
> I'm not. I'd hate for this:
>
> def foo():
> for i in xrange(5):
> yield i
>
> to behave different from this:
>
> def foo():
> yield from xrange(5)
These two forms already behave differently when generators are used
(rather than xrange), why should they not also behave differently when
non-generators are used?
"In the face of ambiguity, refuse the temptation to guess."
I think that an exception makes more sense, otherwise, we are guessing
as to what the programmer intended by using send in your example.
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