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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 easy

How to create a stable cache key from function arguments in Python

Generate a stable SHA-256 cache key from normalized function arguments, with keyword order normalized and tests using mocks.

caching hash key-normalization
Python 
import hashlib
import json
from unittest.mock import Mock


def make_cache_key(*args, **kwargs):
    """Normalize args/kwargs into a stable hash key for caching."""
    normalized = {
        "args": [repr(arg) for arg in args],
        "kwargs": {key: repr(value) for key, value in sorted(kwargs.items())}
    }
    pa…
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