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Programming for GCSE Topic 8.3: Python Turtle Graphics

T eaching L ondon C omputing. Programming for GCSE Topic 8.3: Python Turtle Graphics. William Marsh School of Electronic Engineering and Computer Science Queen Mary University of London. Aims. Outline the idea of turtle graphics Evaluate turtle graphics for learning programming.

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Programming for GCSE Topic 8.3: Python Turtle Graphics

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  1. TeachingLondon Computing Programming for GCSETopic 8.3: Python Turtle Graphics William Marsh School of Electronic Engineering and Computer Science Queen Mary University of London

  2. Aims • Outline the idea of turtle graphics • Evaluate turtle graphics for learning programming

  3. Principles of Turtle Graphics

  4. from turtle import * pencolor('red') pensize(5) fillcolor('yellow') begin_fill() forward(80), left(120) forward(80), left(120) forward(80), left(120) penup() forward(150) circle(80) end_fill() done()

  5. from turtle import * pencolor('red') pensize(5) fillcolor('yellow') begin_fill() forward(80), left(120) forward(80), left(120) forward(80), left(120) penup() forward(150) circle(80) end_fill() done() Pen size and colour Turtle movement Fill– start and end Stop drawing

  6. Documentation • See chapter 23 of Python library • Functions: simpler, as shown • Object-orient methods: more flexible • Simplified extract in the practical sheet • Omits synonyms • More complex features

  7. How Useful Is Turtle Graphics? Could use turtle graphics as an introductions

  8. Advantages • Visual • Picture and simple animation • Text I/O included • Not really for graphical UI or games • Problem solving and creativity • Functions • Obvious need for decomposition into functions

  9. Limitations • Less focus on variables: very important concept • Many problems can be solved (badly) without control structures (if and loops) • Not a great match to GCSE syllabus

  10. Example Challenge Problems • Handle shapes as data • Save in file • E.g. ['square', 100, 30, 40] – size, x, y • Do transformations on shapes • Rotate • Reflect • Display data • E.g. bar or line graph

  11. Summary • Turtle graphics is simple and visual • Consider it as an alternative route for transition between visual (e.g. Scratch) and textual programming

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