Constructor (init)

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Definition

A special method that runs when an object is created and sets its starting attribute values (in Python it is __init__).

Example: def __init__(self, name): self.name = name

Check this one: The syllabus says implement OOP code but does not name constructors; Python classes need __init__ so it is a safe code-pattern card.

Where you'll use it in the test

Syllabus area: Y11 OOP.

Question types it can appear in

Python: Write a class with __init__
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

“A special method that runs when an object is created and sets its starting attribute values (in Python it is __init__).” Then apply it: def __init__(self, name): self.name = name

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: Constructor (__init__) in The Object-Oriented Paradigm (Year 11) · study that set
Memorise: Object-oriented concepts
Notes: Python OOP: classes, inheritance, polymorphism, encapsulation (Python and SQL you must be able to write)
Notes: Programming ML in an OOP language (example only) (Software Automation (Year 12))
Full term page: every question, note and marking comment for Constructor (__init__)

Check yourself

Explain “Constructor (__init__)” in one sentence, give an example, and name a question type that could test it.

Reveal the answer

A special method that runs when an object is created and sets its starting attribute values (in Python it is __init__).

Example: def __init__(self, name): self.name = name

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