interface-py 1.1.0

A package to define interface in python

interface-py

interface-py is a lightweight Python package for defining interfaces and concrete implementations with enforced contracts. It ensures that concrete classes implement all required methods and properties, including optional enforcement of getter/setter properties.

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Features

• Define interfaces using a decorator or base class.
• Enforce that concrete classes implement all interface methods.
• Enforce getter and setter implementation for properties.
• Supports multi-level interface hierarchies.
• Prevents runtime errors from missing implementations.
• Works alongside Python's built-in ABCs.

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Installation

pip install interface-py

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Usage

Defining an Interface

from interface_py import interface

@interface
class HumanInterface:
    def speak(self):
        ...
    
    @property
    def name(self):
        ...
    
    @name.setter
    def name(self, value):
        ...

Multi-level Interface Example

@interface
class MilitaryHumanInterface(HumanInterface):
    def march(self):
        ...

@concrete
class Soldier(MilitaryHumanInterface):
    def speak(self):
        print("Reporting for duty!")

    def march(self):
        print("Marching!")

    @property
    def name(self):
        return self._name
    
    @name.setter
    def name(self, value):
        self._name = value

• MilitaryHumanInterface extends HumanInterface.
• Soldier implements all required methods and properties from both HumanInterface and MilitaryHumanInterface.

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Validation

• Trying to instantiate a concrete class that does not implement all interface methods/properties raises a TypeError.
• Ensures consistent interface contracts across your project.

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Why Use interface-py?

• Provides contract enforcement in dynamically typed Python.
• Helps structure large codebases with clear interface and implementation separation.
• Avoids runtime errors from missing methods or properties.
• Enhances code readability, maintainability, and Pythonic design.

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License

MIT License