Strings and formatting
Slicing, the string methods worth knowing by heart, and f-strings — including why building a string with + in a loop is the wrong reflex.
We mark it against a checklist you can read first
What counts as knowing this
Build and take apart strings without reaching for a loop where a method exists
A check for this one skill
Up to 3 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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What it unlocks
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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