Caching Functions

WeakKeyCache([dict])	Implements a cache that keeps weak references to all elements
WeakLRUCache([size_limit, weak_type])	Implements a cache that keeps weak references to all elements
WeakValueCache(*args, **kwargs)	Implements a cache that keeps weak references to all elements
MaxCache()	A dictionary, can hold infinite strong references
NoCache()	A virtual cache the contains no elements
Cache()	A cache like dict
LRUCache(size_limit)	Implements a simple Least Recently Used Cache