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Mastering Background Tasks in Python: My Journey Building a Task Scheduler From Scratch

  • The author found Celery and Cron to be inadequate for task scheduling in Python.
  • They developed a basic, non-blocking task runner using asyncio.
  • The approach allowed mixing async with blocking logic without freezing the main event loop.
  • The main thread can run the task runner or be spun off into its own daemon thread.
  • They utilized a pattern to handle transient failures like network blips or file locks.
  • The system provided predictable teardown behavior when running as a service.
  • Every job now runs with full visibility, eliminating the need to grep logs.
  • The architecture supported running over 10k jobs per week in production with minimal issues.
  • The project was rewarding and educational, offering insights into Python's concurrency.
  • It emphasized leveraging Python's core primitives to build powerful systems tailored to specific use cases.
  • The author encouraged others to try this approach for scheduling background tasks, starting small and growing iteratively.
  • Automation is highlighted as a means of both saving time and reclaiming control.

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