Tirsvad
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Six pages and a sidebar, each lecture step with its screenshot and what it taught; review record RC-008. Refs #14 Refs #15 Refs #16 Refs #17 Refs #18
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Step 3: the timing wrapper
English · Dansk · Bahasa Malaysia
The wrapper reads the clock before and after the call and prints the difference:
start = clock()
result = function(*args, **kwargs)
seconds = clock() - start
output(RESULT_TEMPLATE.format(name=function.__name__, seconds=seconds))
return result
Run it with python -m speed_calc.lecture_steps 3.
What we gained
- A decorator can run code before and after the function without changing the function.
- The wrapper returns the function's result, so the decorated function still works as before.
make_speed_calc_decorator(clock, output)takes the clock and the output as parameters. The tests give it a fake clock, so they check exact values and never wait for real time.- The text format lives in
constants.py, the one place for constants.