问题描述
我使用python c api并希望从python返回数组.我从python端返回了一个python数组，并希望将PyObject *结果转移到c数组中，以便我可以使用它.
I used python c api and wish to get an array back from python. I returned a python array from the python side and want to transfer the PyObject* result into a c array so I can use it.
反正我能做到吗?
侧面问题:在什么情况下试图返回数组中的元素，如
Side questions: In what circumstance trying to return an element in the array like
return arr[3]
会导致PyObject_callobject返回NULL吗?
will cause the PyObject_callobject return NULL?
return arr
给我一些东西
推荐答案
在Python中，数组"是 list 数据类型.查看C API中的 PyList _ * 函数.您可以在此处为2.7 和此处为3.5 .感兴趣的功能是:
In Python an "array" is a list datatype. Look at the PyList_* functions in the C API. You can find this reference here for 2.7 and here for 3.5. The functions of interest are:
Py_ssize_t PyList_Size(PyObject * list)获取列表成员的数量和 PyObject * PyList_GetItem(PyObject *列表，Py_ssize_t索引)，以获取对该索引处成员的引用.
Py_ssize_t PyList_Size(PyObject *list) to get the number of list members andPyObject* PyList_GetItem(PyObject *list, Py_ssize_t index) to get a reference to the member at that index.
简单使用 malloc 或类似的分配器和 for 循环即可解决问题.
A simple use of malloc or similar allocator and a for loop should do the trick.
还请注意，仅涉及借用的引用，因此不会通过 void Py_INCREF(PyObject * o)和 void Py_DECREF(PyObject * o)来维护这些对象的引用计数是必需的.
Also note that only borrowed references are involved, so no reference count maintenance of these objects via void Py_INCREF(PyObject *o) and void Py_DECREF(PyObject *o) is necessary.
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