Introduction to Decorators: Power Up Your Python Code
summary
Step-by-step tutorial that actually shows working code, exercises, and a repo: implements timer trace register count_calls and a use_unit decorator with live fixes (args/*kwargs, return values, functools.wraps). Demonstrations use time.perf_counter, func_tools.wraps and the pint unit library and mention Flask/click/Numba patterns: uses time.perf_counter and functools.wraps and pint. Includes a striking demo where naive fib(32) causes ~7 million calls: fib(32) triggers ~7 million calls*. Code on GitHub runs as shown.
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chapters (33)
- 0:00Start
- 1:44What Are Decorators
- 3:26What this Course Will Include
- 4:18Introduction to Decorators
- 5:46Inner Functions
- 7:32Functions Are First Class Objects
- 11:43Reversed Print Function
- 21:57Inside Function
- 30:07Decorator Syntax
- 35:05Wrapper Decorator
- 44:19Decorator Factory
- 59:14Trace Decorator
- 1:00:59Random Greet
- 1:05:37Wrapper Function
- 1:07:33Test Cases
- 1:13:47Timer Decorator
- 1:21:08Register Decorator
- 1:23:01Rubber Language Parser
- 1:30:21Summary
- 1:32:54Using Classes as Decorators
- 1:34:34Count Calls
- 1:35:09Fibonacci Numbers
- 1:36:03Recursive Function
- 1:48:10Recap
- 1:49:08A Decorator Is a Function
- 1:50:42Adder Class
- 1:51:46Make a Class Callable
- 2:00:59Decorators in Classes
- 2:11:26Fifth Task
- 2:11:47Create Decorators That Can Take Arguments
- 2:16:25Unit Registry
- 2:18:44Cubase Units
- 2:24:29Create a Decorator
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