Iterating through data structures
I can use iteration to repeatedly add items to lists and check the contents of a string.
Iterating through data structures
I can use iteration to repeatedly add items to lists and check the contents of a string.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Condition-controlled iteration is implemented using while loops in Python.
- A string is like a list in structure but is immutable, so elements cannot be changed, added or removed.
- Some operations that can be performed on lists can also be performed on strings.
Keywords
Iteration - the process of repeating a sequence of instructions within a program loop
String - a data type that is a collection of characters
Mutable - able to be changed
Immutable - not able to be changed
Common misconception
Strings are mutable meaning that any character within the string can be changed.
Strings are immutable. The elements of a string cannot be changed. If changes to the string are required, the whole string must be rewritten.
To help you plan your year 9 computing lesson on: Iterating through data structures, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 computing lesson on: Iterating through data structures, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 computing lessons from the Python programming with sequences of data unit, dive into the full secondary computing curriculum, or learn more about lesson planning.
Equipment
All pupils require access to devices that can edit and run Python programs. Starter code files are available to copy or use directly via the Raspberry Pi Foundation's Code Editor.
Licence
Lesson video
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