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Python Code Samples

Medium snippets you can copy, study, and run in the browser editor.

3 matches
AI & LLM integration patterns medium

Circuit Breaker Pattern in Python for LLM API Calls

Implements a circuit breaker class that wraps LLM client calls to fail fast when the service is degrading, then recover automatically after a timeout.

circuit-breaker llm resilience
Python 
import time

class CircuitBreaker:
    def __init__(self, failure_threshold=3, recovery_timeout=5):
        self.failure_threshold = failure_threshold
        self.recovery_timeout = recovery_timeout
        self.failure_count = 0
        self.state = "closed"
        self.last_failure_time = None

    def call(self, …
15 0 Open
Caching & Redis medium

How to Mock Cache Tag Invalidation in Python

Use unittest.mock.patch with wraps to verify tagged cache entries are invalidated correctly.

unittest mock cache
Python 
import unittest
from unittest.mock import patch

def get_cached_data(cache, key):
    """Return data from cache if present and valid, else None."""
    if cache.get(key, {}).get("valid", False):
        return cache[key]["data"]
    return None

def invalidate_tag_mock(cache, tag):
    """Invalidate all cache entries …
14 0 Open
Microservices patterns medium

Fallback cached response mock in Python

Wraps a mock function with a fallback to a real service and caches results to mask transient failures.

microservices caching fallback
Python 
import time
from functools import wraps

class CachedMock:
    def __init__(self, cache_ttl=5):
        self.cache = {}
        self.cache_ttl = cache_ttl

    def get(self, key):
        cached = self.cache.get(key)
        if cached and time.time() - cached["timestamp"] < self.cache_ttl:
            return cached["v…
14 0 Open

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