class_docstr: A univariate statistic measures a property of a variable.
docstr: Update and return the called instance.
docstr_tok: ["Update","and","return","the","called","instance","."]
code: def update(self, x: numbers.Number):
      """Update and return the called instance."""
      raise NotImplementedError
  
imports: from __future__ import annotations
  import abc
  import numbers
  from river import base
label_desc: Use image node_id 1 for calling the Univariate obj's underlying member method code with example usage: obj.update(x) without return types