054-speed-calc-decorator/docs/wiki/Step-4-Fast-vs-Slow.md

Step 4: fast against slow

English · Dansk · Bahasa Malaysia

@speed_calc_decorator above both functions of the assignment gives the expected output:

@speed_calc_decorator
def fast_function():
    for i in range(1_000_000):
        i * i


@speed_calc_decorator
def slow_function():
    for i in range(10_000_000):
        i * i

Run it with python -m speed_calc.

What we gained

• One decorator times any number of functions; the timing code is written once.
• slow_function loops ten times as often as fast_function, so it takes about ten times as long. The numbers differ on every machine, but the ratio does not.
• A clean layout for a small exercise: src/ for code, tests/ for tests, docs/ for documents, constants.py for constants, and Doxygen comments for the API.