Fixed typo in 16.
Fixed typo in 16.

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