code: def Items(cls):
          
          l = list()
          for attr, value in get_all_attributes(cls):
              # if it's not a class(Constant)
              if not inspect.isclass(value):
                  l.append((attr, value))
  
          return list(sorted(l, key=lambda x: x[0]))
docs: non-class attributes ordered by alphabetical order.
  
          ::
  
              >>> class MyClass(Constant):
              ...     a = 1 # non-class attributre
              ...     b = 2 # non-class attributre
              ...
              ...     class C(Constant):
              ...         pass
              ...
              ...     class D(Constant):
              ...         pass
  
              >>> MyClass.Items()
              [("a", 1), ("b", 2)]
  
          .. versionadded:: 0.0.5