Python while loop

Code pattern

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Definition

while condition: ... repeats while True; make sure the condition changes.

Example

while guess != answer: guess = int(input())

Found in: course specifications, 2025 HSC marking guidelines, sample exam and familiarisation guidelines, school notes.

Where you'll use it in the test

Syllabus area: Code patterns.

Question types it can appear in

Python: Write or complete it in the online Python tool.
Code reading: Code or algorithm reading: interpret a fragment and state its output or purpose.

Where it has appeared in the paper

The Software Engineering Project (Part B). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

Code pattern: “while condition: ...” Then apply it: while guess != answer: guess = int(input())

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Official worked answer

Sample exam Q9 (2 marks): Algorithm design (guessing game) (2 marks): official criteria and sample answer

Criteria

2: Correctly orders the steps. 1: Correctly orders the WHILE and ENDWHILE steps.

Sample answer

Set number = random integer between 0 and 100 WHILE guess <> number Display "Guess a number between 0 and 100:" Get guess ENDWHILE Display "Well Done"

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Go deeper

Flashcard: Python while loop in Code Patterns: Pseudocode, Python, SQL, CSS (Years 11 and 12) · study that set
Memorise: Python basics: input, selection, loops, strings
Full term page: every question, note and marking comment for Python while loop

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