How to Cache Data in Redis with Python

import redis
import json
import time


class Cache:
    def __init__(self, host="localhost", port=6379, db=0, default_ttl=60):
        self.client = redis.Redis(host=host, port=port, db=db)
        self.default_ttl = default_ttl

    def get(self, key):
        value = self.client.get(key)
        if value is None:
            return None
        return json.loads(value)

    def set(self, key, value, ttl=None):
        ttl = ttl or self.default_ttl
        self.client.setex(key, ttl, json.dumps(value))

    def delete(self, key):
        self.client.delete(key)


if __name__ == "__main__":
    cache = Cache()
    cache.set("user:42", {"name": "Alice", "age": 30})
    data = cache.get("user:42")
    print(f"Cached data: {data}")
    cache.delete("user:42")
    print(f"After delete: {cache.get('user:42')}")