Fix intro. Add quote.
Fix intro. Add quote.

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