[issue34427] calling MutableSequence.extend on self produces infinite loop

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> But a MutableSequence can represents a sequence that doesn't
> fit in memory. It can provide an interface to a linear 
> on-disk store. In this case creating an on-memory copy 
> is not possible.

This case is likely not worth worrying about.  If a user created such a sequence AND wrote "s += s", it is unclear whether any particular unpleasant outcome (including the current behavior) could be avoided.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34427>
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