lru_cache

Source:

https://medium.com/lambda-automotive/python-and-lru-cache-f812bbdcbb51

from functools import lru_cache#Option1:lru_cache(maxsize=128, typed=False)  #default: maxsize=128, non-sensitive to type
#Option2:@lru_cache(maxsize=4) 
#Option3:@lru_cache(None)  # maxsize is unlimitedWhen to use: repeated calling. No repetition, no use.
https://docs.python.org/3/library/functools.html