Description: I am trying to use the lru_cache decorator from the functools module to cache instances of two classes, A and B, where B inherits from A. Here is my code:
from functools import lru_cache
@lru_cache(1)
class A:
def __init__(self):
pass
@lru_cache(1)
class B(A):
pass
b = B()
However, when I run this code, I get the following error:
TypeError: lru_cache() missing required argument 'cache_info_type' (pos 4)
I am using Python 3.8, and I am not sure why I am getting this error. Can anyone help me understand what is causing this error and how to fix it? Thank you in advance for your help.
I tried to use the lru_cache decorator to cache instances of two classes, A and B, where B inherits from A. I expected the code to run without errors and to create a single instance of each class, which would be cached and reused if I created another instance of the same class. However, I encountered a TypeError with the message "lru_cache() missing required argument 'cache_info_type' (pos 4)", which I did not expect. I am not sure why this error occurred, and I am seeking help to understand the cause of the error and how to fix it.
When you do
@lru_cache(1)
class A:
def __init__(self):
pass
A is not the class you defined. A is an LRU caching wrapper.
When you then do
@lru_cache(1)
class B(A):
pass
you are trying to inherit from the wrapper, not the class you defined.