Use multiple keys with LRUCache

Question

Can I use multiple/combination of keys in the LRUCache implementation from Cachetools? I want to use it like below

def fun(a,b): pass
x = LRUCache(maxsize=100,missing=fun)

and call it, I tried like below

x[a][b]

and

x[(a,b)]

but doesn't work

Answer 1

missing must be a function of a single argument, but you could use a lambda to wrap fun and unpack the tuple:

x = LRUCache(maxsize=100, missing=lambda args: fun(*args))

and call with:

x[(a, b)]