Allocating Objects on the Heap¶

PyObject*_PyObject_New(PyTypeObject*type)¶

Return value: New reference.

PyVarObject*_PyObject_NewVar(PyTypeObject*type,Py_ssize_tsize)¶

Return value: New reference.

PyObject*PyObject_Init(PyObject*op,PyTypeObject*type)¶

Return value: Borrowed reference. Part of theStable ABI.

Initialize a newly allocated objectop with its type and initialreference. Returns the initialized object. Iftype indicates that theobject participates in the cyclic garbage detector, it is added to thedetector’s set of observed objects. Other fields of the object are notaffected.

PyVarObject*PyObject_InitVar(PyVarObject*op,PyTypeObject*type,Py_ssize_tsize)¶

Return value: Borrowed reference. Part of theStable ABI.

This does everythingPyObject_Init() does, and also initializes thelength information for a variable-size object.

PyObject_New(TYPE,typeobj)¶

Allocate a new Python object using the C structure typeTYPEand the Python type objecttypeobj (PyTypeObject*).Fields not defined by the Python object header are not initialized.The caller will own the only reference to the object(i.e. its reference count will be one).The size of the memory allocation is determined from thetp_basicsize field of the type object.

PyObject_NewVar(TYPE,typeobj,size)¶

Allocate a new Python object using the C structure typeTYPE and thePython type objecttypeobj (PyTypeObject*).Fields not defined by the Python object headerare not initialized. The allocated memory allows for theTYPE structureplussize (Py_ssize_t) fields of the sizegiven by thetp_itemsize field oftypeobj. This is useful for implementing objects like tuples, which areable to determine their size at construction time. Embedding the array offields into the same allocation decreases the number of allocations,improving the memory management efficiency.

voidPyObject_Del(void*op)¶

Releases memory allocated to an object usingPyObject_New orPyObject_NewVar. This is normally called from thetp_dealloc handler specified in the object’s type. The fields ofthe object should not be accessed after this call as the memory is nolonger a valid Python object.

PyObject_Py_NoneStruct¶

Object which is visible in Python asNone. This should only be accessedusing thePy_None macro, which evaluates to a pointer to thisobject.