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Concepts

One page per topic from Lectures 1–4: the idea in a few lines, examples you can read, and links to the slides and notebooks where it is taught.

Lecture 1Variables, print() and f-stringsA variable is a name for a value. print() shows values, and f-strings drop them into text.15 practice questionsLecture 1Data types and converting between themEvery value has a type — int, float, str or bool — and the type decides what you can do with it.15 practice questionsLecture 1Operators: arithmetic, comparison and logicOperators do the maths, compare values, and combine True/False answers.15 practice questionsLecture 2ListsA list holds many values in order. You can index it, slice it and change it.15 practice questionsLecture 2StringsA string is a sequence of characters — indexed and sliced like a list, with its own methods.15 practice questionsLecture 2DictionariesA dictionary is a lookup table: each key points to a value.15 practice questionsLecture 3for loops and range()A for loop runs the same lines once for every item.15 practice questionsLecture 3if, elif and elseif statements let a program make decisions.15 practice questionsLecture 4FunctionsA function packages a few lines under a name, so you can run them again with different inputs.15 practice questionsLectures 1 and 4Errors and how to handle themErrors are normal. Reading the error name tells you what went wrong; try/except lets a program carry on.15 practice questions