Intermediate Challenges

15 challenges covering decorators, generators, classes, async programming, file I/O, and advanced data structures.

Some challenges require standard library imports (noted in each file). No third-party packages are needed.

Challenge List

#	Challenge	Concepts	Time
01	Decorator Timer	Decorators, functools, time	30 min
02	Context Manager	Context managers, file I/O	30 min
03	Generator Pipeline	Generators, yield, chaining	30 min
04	Class Registry	Decorators, classes, global state	35 min
05	Retry Decorator	Decorators, exceptions, backoff	35 min
06	LRU Cache	Dicts, doubly-linked lists, O(1) ops	45 min
07	Event Emitter	Classes, callbacks, pub/sub pattern	35 min
08	Validate Schema	Recursion, dicts, type checking	40 min
09	Parse Log File	String parsing, regex, data classes	35 min
10	Batch Processor	Generators, itertools, chunking	30 min
11	Rate Limiter	Token bucket algorithm, time	40 min
12	Tree Traversal	Trees, BFS, DFS, queues	40 min
13	Async Fetcher	asyncio, aiohttp concepts, semaphore	45 min
14	CLI Parser	String parsing, argument handling	40 min
15	Plugin Loader	importlib, dynamic loading, protocols	45 min

How to Start

Make sure you are comfortable with the beginner challenges before starting these. Each challenge introduces a design pattern or technique used in production Python code.