Message362662
I noticed that `__contains__()` and `__getitem__()` of subclasses of `dict` are much slower. I asked why on StackOverflow, and an user seemed to find the reason.
The problem for him/her is that `dict` implements directly `__contains__()` and `__getitem__()`. Usually, `sq_contains` and `mp_subscript` are wrapped to implement `__contains__()` and `__getitem__()`, but this way `dict` is a little faster, I suppose.
The problem is that `update_one_slot()` searches for the wrappers. If it does not find them, it does not inherit the `__contains__()` and `__getitem__()` of the class, but create a `__contains__()` and `__getitem__()` functions that do an MRO search and call the superclass method. This is why `__contains__()` and `__getitem__()` of `dict` subclasses are slower.
Is it possible to modify `update_one_slot()` so that, if no wrapper is found, the explicit implementation is inherited?
SO answer: https://stackoverflow.com/a/59914459/1763602 |
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Date |
User |
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2020-02-25 20:17:09 | Marco Sulla | set | recipients:
+ Marco Sulla |
2020-02-25 20:17:09 | Marco Sulla | set | messageid: <1582661829.56.0.319745659558.issue39754@roundup.psfhosted.org> |
2020-02-25 20:17:09 | Marco Sulla | link | issue39754 messages |
2020-02-25 20:17:09 | Marco Sulla | create | |
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