docs: def _fullqualname_method_py2(obj):
      """Fully qualified name for 'instancemethod' objects in Python 2.
      """
  
      if obj.__self__ is None:
          # unbound methods
          module = obj.im_class.__module__
          cls = obj.im_class.__name__
      else:
          # bound methods
          if inspect.isclass(obj.__self__):
              # methods decorated with @classmethod
              module = obj.__self__.__module__
              cls = obj.__self__.__name__
          else:
              module = obj.__self__.__class__.__module__
              cls = obj.__self__.__class__.__name__
  
      return module + '.' + cls + '.' + obj.__func__.__name__