Python / Foundations

Python β€” Foundations

Build and trace small programs with explicit values, control flow, functions, collections, and files.

6 lessons Β· No account required

What you will learn

  • Build and trace small programs with explicit values, control flow, functions, collections, and files.

  1. Running Python and reasoning about a program

    A program is a reproducible sequence of instructions. Establish a reliable interpreter, separate the shell from Python, and trace names and output before learning larger constructions.

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  2. Values, types, and expressions

    Choose representations that preserve meaning, perform deliberate conversions, and reason about arithmetic and truth without confusing text with numbers.

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  3. Decisions, loops, and invariants

    Express rules as branches and repeated work as loops, then prove that each iteration makes progress and preserves a useful invariant.

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  4. Functions, contracts, and scope

    Turn repeated calculations into small functions whose inputs, results, and failure conditions are explicit.

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  5. Collections and Unicode text

    Choose collections by access pattern, understand aliasing and copying, and process text without losing its meaning.

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  6. Files and structured data

    Read and write text deliberately, manage resources, and separate storage formats from validation of their contents.

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