@Nullable
  public static PsiElement addClassAttributeIfNotExist(
    @NotNull final PyClass aClass,
    @NotNull final String attributeName,
    @NotNull final String value) {
    if (aClass.findClassAttribute(attributeName, false, null) != null) {
      return null; //Do not add any if exist already
    }
    final PyElementGenerator generator = PyElementGenerator.getInstance(aClass.getProject());
    final String text = String.format("%s = %s", attributeName, value);
    final LanguageLevel level = LanguageLevel.forElement(aClass);

    final PyAssignmentStatement assignmentStatement = generator.createFromText(level, PyAssignmentStatement.class, text);
    //TODO: Add metaclass to the top. Add others between last attributeName and first method
    return addElementToStatementList(assignmentStatement, aClass.getStatementList(), true);
  }
@Nullable
  public static PsiElement addClassAttributeIfNotExist(
    @NotNull final PyClass aClass,
    @NotNull final String attributeName,
    @NotNull final String value)