The question in source code about of funciton--PyObject_CallFunction (in file abstract.c)

[yy x]

hi,all.

 I have remarked the statement of question with blue color in the following funcition, Counld someone answer me?

 

thanks

 

 

 

PyObject *
PyObject_CallFunction(PyObject *callable, char *format, ...)
{
 va_list va;
 PyObject *args, *retval;

 if (callable == NULL)
  return null_error();

 if (format && *format) {
  va_start(va, format);
  args = Py_VaBuildValue(format, va);
  va_end(va);
 }
 else
  args = PyTuple_New(0);

 if (args == NULL)
  return NULL;

 if (!PyTuple_Check(args)) {
  PyObject *a;

  a = PyTuple_New(1);
  if (a == NULL)
   return NULL;
  if (PyTuple_SetItem(a, 0, args) < 0)
   return NULL;//if return from here, why not release the a and args??
  args = a;
 }
 retval = PyObject_Call(callable, args, NULL);

 Py_DECREF(args);

 return retval;
}

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