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Hi,
Is there a way to update/remove cache value returned by cachemethod?
For example, in the below code,
import operator as op
from dataclasses import dataclass, field
from cachetools import TTLCache, cachedmethod
@dataclass
class A:
cache: TTLCache = field(init=False)
def __post_init__(self):
self.cache = TTLCache(maxsize=32, ttl=2 * 3600)
@cachedmethod(cache=op.attrgetter('cache'))
def compute(self, i):
print('value of i', i)
return i * 2Suppose, I want to remove cached value for a given i from cache, then it is not possible to do directly.
Meanwhile, I learned about hashkey function in keys module. But it is not exposed in cachetools __init__, so can not be imported (of course there are hacks around it). Using this, we can updated cached value.
So, I think there could be two solutions to it,
- As
cachemethodwraps a method to enable caching feature in it, so apart from the caching feature, it can add functionality to invalidate. For example,
a = A()
print(a.compute(10))
a.compute.remove(10) # remove can have signature *args, **kwargs. Instead of word `remove`, a more better function name can be thought- Exposing
keysmodule in cachetools__init__.py.
from cachetools.keys import hashkey
a = A()
i = 10
print(a.compute(i))
del a.cache[hashkey(i)]I think approach 1 would be more user friendly.