Abstract method
An abstract method is a method declaration without a complete implementation that requires concrete subclasses or implementing types to provide one.
The Well-Grounded Python Developer: How the pros use Python and Flask
An abstract method is a method declaration that specifies an operation for subclasses without providing its implementation.
- How it is used
- Structures shape-rendering classes around shared behavior and subclass-specific drawing operations.
- How deep it goes
- Explains abstract declarations, non-instantiation, subclass implementation, and method overriding through a shape hierarchy.
- Examples
- Uses Shape, Rectangle, Square, and Circle classes in an onscreen drawing application.
- What you can do after
- Build it from scratch by separating shared shape behavior from subclass-specific drawing implementations.
Software Design for Python Programmers
The abstractmethod decorator marks a method as abstract so that concrete subclasses must implement it.
- How it is used
- Enforces implementation contracts while allowing abstract classes to share state and default behavior.
- How deep it goes
- Explains decoration, instantiation restrictions, inheritance, and duplicated algorithm drawbacks through worked Python examples.
- Examples
- Uses MotorVehicle, Car, Truck, and sports classes to demonstrate required methods, shared workflows, overrides, and duplicated algorithms.
- What you can do after
- Build it from scratch by declaring abstract methods with @abstractmethod and implementing every requirement in concrete subclasses.
Read how Software Design for Python Programmers explains abstract method →
Related concepts
- abstract classpart of · An abstract class is a class intended as a base for subclasses, often not directly instantiable, that can provide shared implementation and declare operations subclasses must implement.
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