[Python-Dev] List mutation in list_repr? (original) (raw)

Patrick Westerhoff PatrickWesterhoff+python at gmail.com
Wed Dec 7 05:19:40 EST 2016

On Tue, Dec 6, 2016 at 5:32 PM, Random832 <random832 at fastmail.com> wrote:

It shouldn't, but it can't be enforced. It's one of those things where if Python assumes all user code is sane (in this case, overridden repr not messing with the list) it can bite in a way that could cause the interpreter to crash.

I guess you are right. That makes sense. I didn’t think about the possibility that although the repr implementation is happening in native code where the user objects have no access to, the list object could still be referenced outside of the repr call.

Thanks a lot for the explanation and your example!

And also thank you Hrvoje Niksic!

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