Defining functions
Parameters, defaults, keyword arguments and return values — and returning a value rather than printing one, which is what makes a function testable.
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What counts as knowing this
Write a function with a clear signature that returns its result rather than printing it
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Up to 2 questions on this skill alone, marked against the bar beside this. It stops as soon as the answer is clear. No account, and your answers are not kept.
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Start on Python Fundamentals
Every skill above, ordered by what depends on what, with the projects above that as the evidence you actually did it. We work out where you already are first, so the path skips what you can do.
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