def get_cache_key(self, filename):
        return '/'.join(filter(None, [self.config.s3_cache_prefix, filename]))
Keeps the angular velocity ratio of a pair of bodies constant. 
dataset/ETHPy150Open paylogic/pip-accel/pip_accel/caches/s3.py/S3CacheBackend.get_cache_key--crossover with--dataset/ETHPy150Open estevaofon/angry-birds-python/pymunk-4.0.0/pymunk/constraint.py/GearJoint.__init__