Within your own C code without INCREFing it.

if you receive a Python object from the Python API, you can use it.

Go take a look at the documentation for PyString_FromString: Why does this matter? Well, we’re creating a PyObject in this code, The reference count reaches 0, Python knows that this object is notīeing used by anything and can be freed (it may not be freed immediately, removed from the list orĭictionary), the reference count is decremented with Py_DECREF. When the object is removedįrom use in that particular place (e.g. Python works on a system of reference counting:Įach time a function “takes ownership” of an object (by, for example,Īssigning it to a list, or a dictionary) it increments that object’s Within PyArg_ParseTuple and we’re just passing the error on up the stack Is that a NULL return from a function that returns PyObject* indicatesĪn error has occurred in this case, the error information is set

One argument, a string (“s” means “string” “ss” would mean “two strings” Is what tells Python that the ‘hello’ wrapper function takes precisely There are two aspects of this code that are worth discussing, evenįirst, error handling: note the PyArg_ParseTuple call.

From re import setup, Extension # the c++ extension module extension_mod = Extension ( 'hello', ) setup ( name = 'hello', ext_modules = )

Linux to windows software wrapper