@Nullable
  @Override
  default PyAstExpression getQualifier() {
    ASTNode qualifier = getNode().findChildByType(PythonDialectsTokenSetProvider.getInstance().getExpressionTokens());
    return qualifier != null ? (PyAstExpression)qualifier.getPsi() : null;
  }
@Nullable
  @Override
  default PyAstExpression getQualifier()