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functools.lru_cache Pitfalls: Unhashable Arguments, Methods Keeping Objects Alive, Stale Results and Shared Mutables

By ThisIsDave — Dave Saylor

Executed on Python 3.10: eviction with maxsize 2, cache_info counts, TypeError unhashable type list, an instance still alive after del because of a method cache, cached_property computing once, stale time values until cache_clear and a shared mutable result.