SF #751062:  Tutorial: remove string exceptions, add parnassus, #posts (Contributed by Gerritt Holl)
SF #751062:  Tutorial: remove string exceptions, add parnassus, #posts
(Contributed by Gerritt Holl)

* Remove the last mentions of string exceptions
* Reference a third-party repository of programs
* Minor clarification of comp.lang.py posting volumes

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator