python dict和ttl支持自动过期缓存

python dict和ttl支持自动过期缓存

 

github: https://github.com/mailgun/expiringdict

  安装

pip install expiringdict

pip install expiring-dict

使用：

from expiringdict import ExpiringDict
from datetime import timedelta

# 创建一个带有过期时间的字典，过期时间为5秒
cache = ExpiringDict(max_len=100, max_age_seconds=5)

# 向字典中添加键值对
cache['key1'] = 'value1'
cache['key2'] = 'value2'

# 从字典中获取键值对
print(cache['key1'])  # 输出: value1

# 等待5秒钟
import time
time.sleep(5)

# 尝试获取已过期的键值对
print(cache.get('key1'))  # 输出: None

# 尝试获取未过期的键值对
print(cache.get('key2'))  # 输出: value2

 

 

Create a dictionary with capacity for 100 elements and elements expiring in 10 seconds:

from expiringdict import ExpiringDict
cache = ExpiringDict(max_len=100, max_age_seconds=10)
put and get a value there:

cache["key"] = "value"
cache.get("key")



copy from dict or OrderedDict:

from expiringdict import ExpiringDict
my_dict=dict()
my_dict['test'] = 1
cache = ExpiringDict(max_len=100, max_age_seconds=10, items=my_dict)
assert cache['test'] == 1



copy from another ExpiringDict, with or without new length and timeout:

from expiringdict import ExpiringDict
cache_hour = ExpiringDict(max_len=100, max_age_seconds=3600)
cache_hour['test'] = 1
cache_hour_copy = ExpiringDict(max_len=None, max_age_seconds=None, items=cache_hour)
cache_minute_copy = ExpiringDict(max_len=None, max_age_seconds=60, items=cache_hour)
assert cache_minute_copy['test'] == 1



pickle :

import dill
from expiringdict import ExpiringDict
cache = ExpiringDict(max_len=100, max_age_seconds=10)
cache['test'] = 1
pickled_cache = dill.dumps(cache)
unpickled_cache = dill.loads(cache)
assert unpickled_cache['test'] == 1