class_docstr: A simple counter.
  
  Attributes
  ----------
  n : int
      The current number of observations.
code: def __init__(self):
      self.n = 0
  
imports: from __future__ import annotations
  from river import stats
label_desc: Use image node_id 1 to create a new Count object from inherited base classes: stats.base with example: obj = Count()