I down loaded the PyRTF package and attempted to run the example.py and other example files under Python 3.4.3 and immediately began having problems. I deduced that, with the lack of a Print("text") function, older methods of opening files and usage of the apply() function, that the code in the install package is vintage Python 2.4 or earlier. I was able to fix up some of the older statements but have been having a real problem with class inheritance issues that pop up in using Papers and Colours. There seems to be a problem with the way objects pass properties.
I think that the PyRTF package needed to be updated to 3.4.3 because Python has changed a lot since 2004.