Track 12 · Lesson 6 of 12

Decorators in depth

Keep function metadata with functools.wraps, write decorators that take arguments, stack them in the right order and cache results with lru_cache.

You will be able to

• Preserve a decorated function's name and docstring with functools.wraps
• Write a decorator factory that takes arguments, such as @retry(times=3)
• Predict the order in which stacked decorators wrap and run
• Speed up repeated pure computations with functools.lru_cache and cache, and know when caching is wrong