Implementing Retry Logic with Exponential Backoff
Context: Your Python service calls an external payment API that occasionally returns HTTP 429 (rate limited) or 503 (service unavailable). …
Jan 20, 2025
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Python Scenario Prep
10 articles
Writing Thread-Safe Python Code
Context: A Python service uses a shared in-memory cache (dict) that is accessed and updated by multiple threads. You’re seeing …
Jan 20, 2025
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Python Service Crashing with OOM in Kubernetes
Context: Your Python service deployed in Kubernetes (256 MB memory limit) is being OOM-killed every few hours. The service reads and …
Jan 20, 2025
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Optimising a Slow Data Processing Pipeline
Context: A batch job that processes 10 million CSV rows runs for 4 hours. Each row is parsed, validated, transformed, and inserted into a …
Jan 20, 2025
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Debugging a Circular Import Error
Context: Your Python application raises ImportError: cannot import name 'UserService' from partially initialized module 'app.services' at …
Jan 20, 2025
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Designing a Rate Limiter in Python
Context: Your public API is getting hammered. You need to implement a rate limiter that allows 100 requests per minute per API key, …
Jan 20, 2025
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CPU-Bound Task Blocking the Async Event Loop
Context: Your FastAPI service processes image thumbnails on upload. When a user uploads a large image, the API becomes unresponsive for all …
Jan 20, 2025
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Race Condition in an Async Python Service
Context: You have a FastAPI service where two concurrent requests can both check if a username is available and both register the same …
Jan 20, 2025
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Slow API Endpoint: N+1 Query Problem
Context: A Django REST API endpoint that lists all users and their order counts is responding in 8 seconds for 500 users. The database has …
Jan 20, 2025
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Memory Leak in a Long-Running Python Service
Context: You deployed a Python microservice that processes incoming webhook events. After a few hours of running in production, memory usage …
Jan 20, 2025
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