cpython - Python dequeue.remove implementation -


why python dequeue.remove() implementation rotates list -1 each iteration, 1 one? why not rotate list -i, popleft rotate i again?

static pyobject * deque_remove(dequeobject *deque, pyobject *value) {     py_ssize_t i, n=py_size(deque);      (i=0 ; i<n ; i++) {         pyobject *item = deque->leftblock->data[deque->leftindex];         int cmp = pyobject_richcomparebool(item, value, py_eq);          if (py_size(deque) != n) {             pyerr_setstring(pyexc_indexerror,                 "deque mutated during remove().");             + −return null;         }         if (cmp > 0) {             pyobject *tgt = deque_popleft(deque, null);             assert (tgt != null);             if (_deque_rotate(deque, i))                 return null;             py_decref(tgt);             py_return_none;         }         else if (cmp < 0) {             _deque_rotate(deque, i);             return null;         }         _deque_rotate(deque, -1);     }     pyerr_setstring(pyexc_valueerror, "deque.remove(x): x not in deque");     return null; }


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