4  Lists and Queues

Chapter Outline:

• 4.1. Persistent Lists (db.list)
  • A full-featured, persistent Python list.
  • Full support for: push, pop, prepend, deque, slicing my_list[1:5], and in-place updates my_list[0] = ....
• 4.2. Priority Queues (db.queue)
  • Creating a persistent, multi-process task queue.
  • Adding tasks: .put(data, priority=N) (lower number is higher priority).
  • Consuming tasks: The blocking .get(timeout=N) method.
  • Use Case: A multi-process producer/consumer pattern.