@Override
  @Nullable
  default PyAstExpression getQualifier() {
    final ASTNode[] nodes = getNode().getChildren(PythonDialectsTokenSetProvider.getInstance().getExpressionTokens());
    return (PyAstExpression)(nodes.length == 1 ? nodes[0].getPsi() : null);
  }
@Override
  @Nullable
  default PyAstExpression getQualifier()