code: def append(self, time=None, duration=None, value=None, confidence=None):
          '''Append an observation to the data field
  
          Parameters
          ----------
          time : float >= 0
          duration : float >= 0
              The time and duration of the new observation, in seconds
          value
          confidence
              The value and confidence of the new observations.
  
              Types and values should conform to the namespace of the
              Annotation object.
  
          Examples
          --------
          >>> ann = jams.Annotation(namespace='chord')
          >>> ann.append(time=3, duration=2, value='E#')
          '''
  
          self.data.add(Observation(time=float(time),
                                    duration=float(duration),
                                    value=value,
                                    confidence=confidence)f append(self, time=None, duration=None, value=None, confidence=None):
          '''Append an observation to the data field
  
          Parameters
          ----------
          time : float >= 0
          duration : float >= 0
              The time and duration of the new observation, in seconds
          value
          confidence
              The value and confidence of the new observations.
  
              Types and values should conform to the namespace of the
              Annotation object.
  
          Examples
          --------
          >>> ann = jams.Annotation(namespace='chord')
          >>> ann.append(time=3, duration=2, value='E#')
          '''
  
          self.data.add(Observation(time=float(time),
                                    duration=float(duration),
                                    value=value,
                                    confidence=confidence))
docs: Append an observation to the data field
  
          Parameters
          ----------
          time : float >= 0
          duration : float >= 0
              The time and duration of the new observation, in seconds
          value
          confidence
              The value and confidence of the new observations.
  
              Types and values should conform to the namespace of the
              Annotation object.
  
          Examples
          --------
          >>> ann = jams.Annotation(namespace='chord')
          >>> ann.append(time=3, duration=2, value='E#')