Caching & Redis
Cache-aside, TTL, invalidation, hot keys, and in-memory lookup patterns at scale.
How to Implement a Redis-Like Cache Dictionary in Python
Build a RedisMockDict class that mimics basic Redis key-value operations with TTL support, expiry cleanup, and standard dict-like methods.
from collections import OrderedDict
import time
class RedisMockDict:
def __init__(self, ttl=None):
self._data = OrderedDict()
self._ttl = ttl # default TTL in seconds, None = no expiry
self._expiry = {}
def set(self, key, value, ttl=None):
"""Set a key-value pair with optiona…Mock Redis Distributed Lock in Python with SET NX EX
A minimal in-memory mock of Redis SET NX EX distributed lock semantics for testing concurrent code without a real Redis server.
import time
import threading
import uuid
from typing import Optional
class RedisLockMock:
"""A minimal mock of Redis SET NX EX distributed lock semantics."""
def __init__(self):
self._store = {} # key -> (value, expiry_epoch)
def acquire(self, key: str, token: str, ttl_seconds: int) -> bool:
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Caching & Redis — Python code examples
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