def index(self):
courses = Course.query()
course_arr = []
for course in courses:
course_arr.append(course.dict())
self.response.write(json.dumps(course_arr))
def deleteAll():
ndb.delete_multi(Assignment.query().fetch(keys_only=True))
ndb.delete_multi(Course.query().fetch(keys_only=True))
ndb.delete_multi(Grade.query().fetch(keys_only=True))
ndb.delete_multi(Student.query().fetch(keys_only=True))
