Key question
How do I turn an idea into a program?
Check your understanding
Find an example, an application and a limit. Explain the concept without using its name, then compare your explanation with a primary source.
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Claims to examine
Explicit data boundaries and tests make a small Python program easier to inspect and change.
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How do I turn an idea into a program?
Learn Python through a small command-line tool: data, functions, files, tests and clear error handling.