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Description:

pygopherinterfaces 0.1.3

Go-style interfaces for Python

Interfaces in the Go programming language are a bit different than those found in Java or C++, as they
are implicit. This means that there is no explicit “implements” relationship
between the interface definition and an implementation of the defined interface. A type implements an interface by
implementing all of the methods defined. When we wish to define an interface in Python, we typically use abstract
base classes to define them because we can enforce implementation of methods. This requires us to use inheritance,
which couples the interface and the implementation.
This package emulates Go-style interfaces by creating an Interface metaclass that can be used to construct Python
classes that override issubclass to test whether a class implements the methods of the interface class, rather than
whether it inherits from the interface class.
This is a tiny package that emulates on of my favorite features of Go.

Installation
pip install pygopher-interfaces
# or:
# pipenv install pygopher-interfaces
# poetry add pygopher-interfaces

Usage
To create an interface class, use the Interface metaclass.
from pygopher.interfaces import Interface

class RepositoryInterface(metaclass=Interface):
def get(account_id: int) -> Account:
raise NotImplementedError

def add(account: Account):
raise NotImplementedError

class MysqlRepository:
def get(account_id: int) -> Account:
...

def add(account: Account):
...

>>> issubclass(MysqlRepository, RepositoryInterface)
True