Fixed a typo in one of the code examples where [ ] were used around a dictionary object.
Fixed a typo in one of the code examples where [ ] were used around a dictionary object.

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