[Python-ideas] Membership of infinite iterators

Paul Moore p.f.moore at gmail.com
Wed Oct 18 06:26:52 EDT 2017

On 18 October 2017 at 10:56, Koos Zevenhoven <k7hoven at gmail.com> wrote:
> I'm unable to reproduce the "uninterruptible with Ctrl-C" problem with
> infinite iterators. At least itertools doesn't seem to have it:
>>>> import itertools
>>>> for i in itertools.count():
> ...     pass
> ...
> ^CTraceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> KeyboardInterrupt

That's not the issue here, as the CPython interpreter implements this
with multiple opcodes, and checks between opcodes for Ctrl-C. The
demonstration is:

>>> import itertools
>>> 'x' in itertools.count()

... only way to break out is to kill the process.

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