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"""

pip3 install cachetools

https://pypi.org/project/cachetools/

"""

from cachetools import cached, LRUCache, TTLCache

import time

@cached(cache={})

def ex1_cache():

print('no cached')

return 'my data'

def ex1():

for _ in range(3):

print(ex1_cache())

# 手動清理快取

# ex1_cache.cache_clear()

# for _ in range(3):

# print(ex1_cache())

@cached(LRUCache(maxsize=10))

def ex2_cache(count):

print('no cached')

return 'my data'

def ex2():

print('step1...')

for i in range(10):

# 這裡沒快取 因為第一次

print(ex2_cache(i))

print('step2...')

for i in range(10):

# 這裡都有快取

print(ex2_cache(i))

print('step3...')

for i in range(30, 40):

# 快取開始失效, 因為超過 maxsize

print(ex2_cache(i))

@cached(TTLCache(maxsize=5, ttl=2))

def ex3_cache():

print('no cached')

return 'my data'

def ex3():

for _ in range(5):

print(ex3_cache())

time.sleep(3)

# 快取失效

for _ in range(5):

print(ex3_cache())

MY_CACHE = TTLCache(maxsize=200, ttl=2)

def set_cache():

MY_CACHE['1'] = '1'

MY_CACHE['2'] = '2'

MY_CACHE['3'] = '3'

def get_cache():

if MY_CACHE.get('1'):

print('cached')

print(MY_CACHE.get('1'))

else:

print('no cached')

def ex4():

set_cache()

for _ in range(3):

get_cache()

print('查看目前 cache 狀態:', dict(MY_CACHE))

print('sleep 2.5 sec')

time.sleep(2.5)

# cached expired

get_cache()

if __name__ == '__main__':

ex1()

# ex2()

# ex3()

# ex4()