class_docstr: A base class for blocks
  
  Parameters
  ----------
  ax : matplotlib.axes.Axes, optional
      The matplotlib axes to attach the animation to.
      Defaults to matplotlib.pyplot.gca()
  t_axis : int, optional
      The axis of the data that represents time.
  
  Attributes
  ----------
  ax : matplotlib.axes.Axes
      The matplotlib axes that the block is attached to.
class_docstr_tok: ["A","base","class","for","blocks","Parameters","--","--","--","--","--","ax",":","matplotlib.axes.Axes",",","optional","The","matplotlib","axes","to","attach","the","animation","to",".","Defaults","to","matplotlib.pyplot.gca","(",")","t_axis",":","int",",","optional","The","axis","of","the","data","that","represents","time",".","Attributes","--","--","--","--","--","ax",":","matplotlib.axes.Axes","The","matplotlib","axes","that","the","block","is","attached","to","."]
docstr: Returns the length of the 'time' axis
docstr_tok: ["Returns","the","length","of","the","'time","'","axis"]
code: def __len__(self):
      """Returns the length of the 'time' axis"""
      raise NotImplementedError()
  
imports: import matplotlib.pyplot
label_desc: Use image node_id 4 for calling the Block obj's underlying member method code with example usage: obj.__len__() without return types