@NotNull
  private Deque<PyExpression> getParameters() {
    final PyExpression[] childrenOfType = PsiTreeUtil.getChildrenOfType(this, PyExpression.class);
    if (childrenOfType == null) {
      return new ArrayDeque<>(0);
    }
    return Queues.newArrayDeque(Collections2.filter(Arrays.asList(childrenOfType), NO_KEY_ARGUMENTS));
  }
@NotNull
  private Deque<PyExpression> getParameters()