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Caching & Redis

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

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Caching & Redis medium

How to Implement an LFU Cache in Python

Implement a Least Frequently Used (LFU) cache with frequency tracking dictionaries to evict the least accessed items when capacity is reached.

lfu cache frequency
Python 
class LFUCache:
    def __init__(self, capacity: int):
        self.capacity = capacity
        self.data = {}
        self.freq = {}
        self.min_freq = 0

    def get(self, key: int) -> int:
        if key not in self.data:
            return -1
        self._increment_freq(key)
        return self.data[key]

  …
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