Updated teaching guide.
Updated teaching guide.

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