[Python-ideas] Implicit submodule imports

[Guido van Rossum]

The older custom allocators may not bump the type's refcount when creating
an instance.

On Fri, Sep 26, 2014 at 1:51 PM, Greg Ewing <greg.ewing at canterbury.ac.nz>
wrote:

> Nathaniel Smith wrote:
>
>> This code has been around forever, but I don't know why. AFAIK we
>> could replace the above with
>>
>>     if (compatible_for_assignment(oldto, newto, "__class__")) {
>>         if (newto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
>>             Py_INCREF(newto);
>>         }
>>         Py_TYPE(self) = newto;
>>         if (oldto->tp_flags & Py_TPFLAGS_HEAPTYPE) {
>>            Py_DECREF(oldto);
>>         }
>>         return 0;
>>     }
>>
>
> Is it even necessary to worry about the refcounting?
> Presumably the non-heap type objects all start out with
> a refcount of at least 1, so there's no danger of them
> getting deallocated.
>
> --
> Greg
>
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-- 
--Guido van Rossum (python.org/~guido)
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