Flask支持Local Cache的两种方法

方法1:

使用functiontools.lru_cache,封装成一个function装饰器

把这个代码放到一个文件里

from functools import lru_cache, wraps
from datetime import datetime, timedelta
def timed_lru_cache(seconds: int, maxsize: int = 128):
    def wrapper_cache(func):
        func = lru_cache(maxsize=maxsize)(func)
        func.lifetime = timedelta(seconds=seconds)
        func.expiration = datetime.utcnow() + func.lifetime
        @wraps(func)
        def wrapped_func(*args, **kwargs):
            if datetime.utcnow() >= func.expiration:
                func.cache_clear()
                func.expiration = datetime.utcnow() + func.lifetime
            return func(*args, **kwargs)
        return wrapped_func
    return wrapper_cache

使用方式:

@timed_lru_cache(10)
def get_article_from_server(url):
    print("Fetching article from server...")
    response = requests.get(url)
    return response.text

参考文章:https://realpython.com/lru-cache-python/

方法2

直接使用一个模块叫cachetools

from cachetools import cached, LRUCache, TTLCache
# speed up calculating Fibonacci numbers with dynamic programming
@cached(cache={})
def fib(n):
    return n if n < 2 else fib(n - 1) + fib(n - 2)
# cache least recently used Python Enhancement Proposals
@cached(cache=LRUCache(maxsize=32))
def get_pep(num):
    url = 'http://www.python.org/dev/peps/pep-%04d/' % num
    with urllib.request.urlopen(url) as s:
        return s.read()
# cache weather data for no longer than ten minutes
@cached(cache=TTLCache(maxsize=1024, ttl=600))
def get_weather(place):
    return owm.weather_at_place(place).get_weather()

地址:https://github.com/tkem/cachetools

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