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import logging

import sys

import time

import attr

logging.basicConfig(stream=sys.stderr, level=logging.INFO)

@attr.s(cache_hash=True, frozen=True)

class CacheHash:

x = attr.ib()

y = attr.ib()

@attr.s(cache_hash=False, frozen=True)

class NoCacheHash:

x = attr.ib()

y = attr.ib()

if __name__ == "__main__":

cache_hash = CacheHash(100, 200)

no_cache_hash = NoCacheHash(100, 200)

N = 10000000

start = time.time()

for _ in range(N):

hash(cache_hash)

logging.info("cache hash cost %s s", time.time() - start) # about 2.724s

start = time.time()

for _ in range(N):

hash(no_cache_hash)

logging.info("cache hash cost %s s", time.time() - start) # about 3.375s