class_docstr: Return a callable object that calls the given method on its operand.
  
  Unlike the builtin `operator.methodcaller`, instances of this class are
  serializable
code: def __str__(self):
      return "<%s: %s>" % (self.__class__.__name__, self.method)
  
label_desc: Use image node_id 4 for calling the methodcaller obj's underlying member method code with example usage: obj.__str__() and returns: unknown