KS3 Computer Science Year 9: Python: Strings & Random – 7 lessons

7 ready-to-teach KS3 Computer Science lessons for Year 9: Python: Strings & Random. Editable slides, lesson plans, worksheets and full answers.

The last KS3 programming unit: text handling, random numbers and turning IGCSE-style pseudocode into Python. No functions or modular programming; those start in Year 10.

What’s included

• 7 PowerPoint lessons, one per lesson, with photos, click-by-click activities and speaker notes
• Lesson plan pack (Word): objectives and a timed 50-minute plan for every lesson, plus teacher notes
• 7 student worksheets (Word), ready to print or edit
• Answer pack (Word) with answers for every worksheet section

Lessons

1. Welcome back: Year 8 retrieval quiz and Programming 2 recap
2. String handling: len, upper, lower and indexing
3. Slicing and joining strings: making usernames
4. Random numbers and random choices
5. Bug hunt: finding and fixing errors on paper
6. From pseudocode to Python: IGCSE-style tasks
7. Build a guessing game (assessed)

Key vocabulary

string, index, slice, concatenation, random, pseudocode

Assessment

Guessing game using a loop, selection and random (L7).

Format

• PowerPoint (.pptx) and Word (.docx), fully editable
• Works in PowerPoint and Google Slides (some animations may look different in Google Slides)
• Written for the English national curriculum for KS3 computing, and builds towards GCSE / IGCSE Computer Science

Photos are from Wikimedia Commons under free licences and are credited on each slide and in LICENSES.txt.