tuple.c

// Create a new C tuple object of size 3.
typle = PyTuple_New(3)

// Manually check if tuple is created correctly. 
if (tuple == NULL)
    return NULL;

for (i=0; i<3; i++) {
  
  // Create Python integer.
  item = PyInt_FromLong(42);

  // Again, manually check if everything went well. 
  // If not, decrease reference counter of tulpe object.
  if (item == NULL) {
    // Decrease references counter to tuple object.
    Py_DECREF(tuple);
    return NULL; 
  }
  // Set i-th item of tuple to 42.
  PyTuple_SET_ITEM(tuple, i, item);
}