Python c python-c-api python-c-extension

释放 PyTuple 对象

发布于 2024-10-15 21:31:37 字数 539 浏览 1 评论 0原文

使用 Python C-API 释放 PyTuple 对象的正确方法是什么？

我知道元组在引用计数语义方面有些特殊，因为 PyTuple_SetItem “窃取”对插入元素的引用。我还知道减少元组对象的引用会减少元组中所有元素的引用计数。

考虑到这一点，我认为应该可以肯定地说：

#include <Python.h>
#include <stdio.h>

int main()
{
    PyObject* tup = PyTuple_New(1);
    PyTuple_SetItem(tup, 0, PyLong_FromLong(100L));

    printf("Ref Count: %d\n", tup->ob_refcnt);
    Py_DECREF(tup);
}

但是当我减少元组引用计数时，最后一行会导致分段错误。我不明白为什么会发生这种情况。在调用 Py_DECREF 之前，引用计数为 1，那么这里有什么问题呢？

原文

What is the proper way to free a PyTuple object using the Python C-API?

I know that tuples are somewhat special when it comes to the reference counting semantics, since PyTuple_SetItem "steals" the reference to the inserted element. I also know that decrementing the reference of a tuple object decrements the reference count of all the elements in the tuple.

With this in mind, I would think it should be safe to say:

#include <Python.h>
#include <stdio.h>

int main()
{
    PyObject* tup = PyTuple_New(1);
    PyTuple_SetItem(tup, 0, PyLong_FromLong(100L));

    printf("Ref Count: %d\n", tup->ob_refcnt);
    Py_DECREF(tup);
}

But the last line causes a Segmentation Fault, when I decrement the tuple reference count. I don't understand why this happens. Right before the call to Py_DECREF the reference count is 1, so what's the issue here?

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