Track 12 · Lesson 5 of 12

Decorators

Wrap functions to add logging, counting, validation and timing without touching their code, and understand what the @ syntax really does.

You will be able to

• Treat functions as values: pass them in, return them and store them
• Write a decorator with a wrapper that forwards *args and **kwargs and returns the result
• Explain that @decorator is shorthand for func = decorator(func)
• Use decorators for logging, counting calls and validating arguments
• Recognise when a decorator hides too much and plain code is better