@serhiy-storchaka I have proposed a fix to make array.fromlist() safe against reentrant__index__ calls that mutate the input list, and I have added a regresion test. Please let me know if this approach is appropriate when you have time. Thankyou!

Thanks@vstinner for constant suggestions and changes, your feedback is much appriciated and very helpful for me, I will stick to the format and try not to repeat same mistakes in future.

I am not sure this is the right way to fix this issue. Instead of changing some setitems (what about others?), would not it be better to handle this inarray.fromarray() and other methods that pass borrowed references to setters?

There was also other similar array issue.

Instead of changing some setitems (what about others?)

I checked the other setters and they don't seem to be vulnerable to the borrowed reference issue. They cannot call arbitrary Python code while using the borrowed reference.

would not it be better to handle this in array.fromarray() and other methods that pass borrowed references to setters?

I'm not sure that it would better, it would be basically the same, but requires to modify more code, no?

There was also other similar array issue.

Would you mind to elaborate?