Added Docstrings for append and render methods.
Added Docstrings for append and render methods.

UWPCE-PythonCert/IntroPython2016,weidnem/IntroPython2016,weidnem/IntroPython2016,UWPCE-PythonCert/IntroPython2016,UWPCE-PythonCert/IntroPython2016,weidnem/IntroPython2016