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Lecture 6 Decorators
Tirsvad edited this page 2026-11-06 06:14:14 +01:00
Lecture 6: Decorators and the @ syntax
English · Dansk · Bahasa Malaysia
What the lecture covers
A decorator adds behaviour to an existing function without editing it. The lecture first recaps first-class functions, nesting and returning functions, then introduces the @ syntax: writing @make_bold above a function is the same as say_hello = make_bold(say_hello). Flask uses the same idea for its routes: @app.route("/"). With functools.wraps the wrapped function keeps its name.
What we gained
- The
@syntax as shorthand for passing a function to a wrapper. - Stacking decorators: the one nearest the function runs first, so
@make_bold @make_emphasis @make_underlinedgives<b><em><u>...</u></em></b>. - An understanding of what
@app.route("/")does in the next lectures.
In this repository
Code: src/flask_day_54/domain/decorators.py. Tests: tests/unit/test_decorators.py.