cachemethod 1.0.0

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cachemethod

python's missing cache functionality, you can cache a regular function you can cache staticmethod and classmethod but you can't really cache a method that takes self.

pip3 install cachemethod

why can't I use cache on a method that takes self?

python cache doesn't actually stores the hash of the *args and *kwargs (including self), but it puts it into a tuple (which is hashable) and that tuple is used as a key in the cache dict, thus storing the reference to self in that tuple causes the instance to be a live until the cache is cleared or it runs of our space (if you use lru_cache)

why not just hash the items then?

the default hash implementation for classes uses the allocated memory for instances, so if an instance memory gets freed, the cache is not really valid anymore but it is still in the cache dict, so instance that was created on the same memory and passed the same arguments can hit the cache and cause unexpected results

how this package solves the issue

it creates a seed which is a random integer and attaches it to the instance, based on that seed caching is done not relying on the class hash and not storing references