Input validation and robust programs
Validate a whole-number age between 11 and 18.
OCR J277 2.2 / AQA 8525 programming
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Open lesson →Free GCSE Python course · OCR & AQA
Python for GCSE Computer Science
Build on Python Foundations with searching, sorting, validation, files, testing and an independent programming project. Nine original guided lessons with runnable code and separate solutions.
Aligned broadly to the programming skills in OCR J277 and AQA 8525. Always use your current specification for exact assessment requirements.
Learning progress: 0 of 9 lessons completed in this browser.
Python students preparing for exams: Learn to translate OCR and AQA pseudocode into Python with examples and practice questions.
Linear search and Boolean flags
Find a target in an unsorted list without using in or index().
OCR J277 2.1 / AQA 8525 algorithms
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Open lesson →Binary search and invariants
Search a sorted list using low, high and mid pointers.
OCR J277 2.1 / AQA 8525 algorithms
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Open lesson →Bubble sort and trace tables
Swap adjacent out-of-order items and record the result of each pass.
OCR J277 2.1 / AQA 8525 algorithms
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Open lesson →Two-dimensional lists and nested loops
Calculate row totals and the largest score in a grid.
OCR J277 2.2 / AQA 8525 programming
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Open lesson →Functions, parameters and returns
Use reusable functions to calculate average and assign a category.
OCR J277 2.2 / AQA 8525 programming
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Open lesson →Text files and exception handling
Write results to a file, then read and total the values safely.
OCR J277 2.2 / AQA 8525 programming
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Open lesson →Test plans, trace tables and debugging
Design normal, boundary and invalid tests for a function.
OCR J277 2.3 / AQA 8525 testing
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Open lesson →GCSE mini-project: quiz and scoreboard
Combine selection, lists, functions, validation and testing into one quiz.
OCR J277 programming / AQA 8525 programming
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Open lesson →A-level Python programming
Move beyond GCSE into object-oriented design, recursive algorithms, data structures, databases and project development.
New: Interactive Python code tracing and debugging
Step through worked code examples and try original GCSE and A-level output and debugging quizzes.
Open Python Practice →