class_docstr: Animates an axes title.
  
  Follows the same syntax as a format-string, but the values to be replaced
  must be given as an array of values for each timestep.
  
  Alternatively can just accept a list of strings, one for each timestep.
  
  Parameters
  ----------
  text : str or list of str
      Text to display as the title.
      Either supplied as a list of strings, one for each timestep, or as a
      base string with curly braces for any "replacement fields".
  ax : matplotlib.axes.Axes, optional
      The matplotlib axes to attach the block to.
      Defaults to matplotlib.pyplot.gca()
  mpl_kwargs: dict, optional
      Keyword arguments to pass to matplotlib.pyplot.title()
  args : optional
      Passed on to str.format()
  kwargs : optional
      If kwarg matches a field in the format string, then passed on to
      str.format(), else passed on to matplotlib.axes.Axes.set_title().
  
  Attributes
  ----------
  ax : matplotlib axis
      The matplotlib axes that the block is attached to.
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code: def __len__(self):
      return self._length
  
imports: from string import Formatter
  from .base import Block
label_desc: Use image node_id 3 for calling the Title obj's underlying member method code with example usage: obj.__len__() and returns: self