Added some ideas for part 3 examples in the control flow lesson.
Added some ideas for part 3 examples in the control flow lesson.

PyClass/PyClassLessons,razzius/PyClassLessons,razzius/PyClassLessons,noisebridge/PythonClass,noisebridge/PythonClass,noisebridge/PythonClass,razzius/PyClassLessons,PyClass/PyClassLessons,noisebridge/PythonClass,razzius/PyClassLessons,PyClass/PyClassLessons