Global and local variables

Code pattern

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Definition

A local variable exists only inside its function; a global variable is declared outside and can be used throughout (use the global keyword to change it inside a function).

Example

count = 0 (global); def add(): global count

Found in: course specifications.

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.
Multiple choice: Pick the option that matches the definition or example.

How to use it

A model sentence

General advice, built from the definition and example above

Code pattern: “A local variable exists only inside its function; a global variable is declared outside and can be used throughout (use the global keyword to change it inside a function).” Then apply it: count = 0 (global); def add(): global count

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.

Go deeper

Flashcard: Global and local variables 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 Global and local variables

Check yourself

Write or say the “Global and local variables” pattern from memory: the syntax and what it does.

Reveal the answer

A local variable exists only inside its function; a global variable is declared outside and can be used throughout (use the global keyword to change it inside a function).

Example: count = 0 (global); def add(): global count

Could be tested as: Python, Code reading, Multiple choice.