class_docstr: A rolling univariate statistic measures a property of a variable over a window.
code: def name(self):
      return f"{super().name}_{self.window_size}"
  
imports: from __future__ import annotations
  import abc
  import numbers
  from river import base
label_desc: Use image node_id 2 for calling the RollingUnivariate obj's underlying member method code with example usage: obj.name() and returns: super, str, self