TypeError: issubclass() arg 1 must be a class

[KaliCharan-V]

Installed latest version of aiocache: pip install aiocache
Code: cache = Cache(Cache.MEMORY)
Error: if not issubclass(cache_class, BaseCache):
TypeError: issubclass() arg 1 must be a class

[Dreamsorcerer]

Unable to reproduce:

> pip3 install aiocache --upgrade
...
Successfully installed aiocache-0.12.2
> python3
Python 3.10.4 (main, Jun 29 2022, 12:14:53) [GCC 11.2.0] on linux
>>> import aiocache
>>> aiocache.Cache(aiocache.Cache.MEMORY)
<aiocache.backends.memory.SimpleMemoryCache object at 0x7fcaa53a8c10>
>>>

[MeiHuaGuangShuo]

New version of aiocache==0.12.3 will not raise TypeError again at code cache = Cache(Cache.MEMORY)

But if you are using decorator to cache the result which you have seen a post ask you to do with the following code, the TypeError will raise at there again.

from aiocache import cached, Cache

cache = Cache(Cache.MEMORY)

@cached(cache=cache, ttl=3600)  # <-- Here
async def expensive_operation():
    await asyncio.sleep(5)
    return "result"

It's incorrect! According to the usage of official page, to work with decorator, you can directly give the Cache.MEMORY to cache parameter instead of Cache(Cahce.MEMORY)

Using the follow code can be useful(at least on my server)

from aiocache import cached, Cache

cache = Cache.MEMORY

@cached(cache=cache, ttl=3600)
async def expensive_operation():
    await asyncio.sleep(5)
    return "result"

Hope it will fix your problem