WARNING: PyList_SetItem does not increment the new item's reference
count, but does decrement the reference count of the item it replaces,
if not nil. It does *decrement* the reference count if it is *not*
inserted in the list. Similarly, PyList_GetItem does not increment the
returned item's reference count.
WARNING: PyList_SetItem does not increment the new item's reference count, but does decrement the reference count of the item it replaces, if not nil. It does *decrement* the reference count if it is *not* inserted in the list. Similarly, PyList_GetItem does not increment the returned item's reference count.