Removed unnecessary imports in readsample.py.
Removed unnecessary imports in readsample.py.

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