def they_collide(self, obj1, obj2):
        pass
Get a stream of boto Key objects for each key inside
dataset/ETHPy150Open los-cocos/cocos/cocos/collision_model.py/CollisionManager.they_collide--crossover with--dataset/ETHPy150Open Yelp/mrjob/mrjob/fs/s3.py/S3Filesystem.get_s3_keys