Reference library

Caching & Redis

Cache-aside, TTL, invalidation, hot keys, and in-memory lookup patterns at scale.

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Caching & Redis easy

How to Invalidate a Cache in Python with lru_cache

This code demonstrates how to clear the cache of an @lru_cache decorated function in Python using cache_clear(), showing the effect on cached results.

lru_cache cache-invalidation functools
Python 
from functools import lru_cache
import time

@lru_cache(maxsize=None)
def expensive_operation(key):
    return f"Computed value for {key} at {time.time():.6f}"

def invalidate_cache():
    expensive_operation.cache_clear()

if __name__ == "__main__":
    print(expensive_operation("alpha"))
    print(expensive_operatio…
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