abc_demo.py

import abc


class ConfigSource(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    def sync(self, dest: str) -> bool:
        return NotImplemented


class ObtuseAngle:
    def talk(self):
        print("I'm obtuse")


class LocalConfigSource:
    def sync(self, dest: str) -> bool:
        print(f"Syncing from local to {dest}")
        return True


class S3ConfigSource(ConfigSource):
    def sync(self, dest: str) -> bool:
        print(f"Syncing from s3 to {dest}")
        return True


class OnedriveConfigSource(ConfigSource):
    def blabula(self):
        pass


class ConfigService:
    def __init__(self):
        self._sources = {}

    def add_source(self, name: str, source: ConfigSource):
        if name in self._sources:
            raise ValueError(f"Variant {name} already exists")
        self._sources[name] = source

    def source_names(self):
        return self._sources.keys()

    def sync(self, name: str, dest: str) -> bool:
        if not name in self._sources:
            raise ValueError(f"Unknown variant {name}")
        return self._sources[name].sync(dest)


def protected_call(fn):
    try:
        fn()
    except Exception as ex:
        print(f"{type(ex).__name__}: {ex}")


if __name__ == "__main__":
    service = ConfigService()
    protected_call(lambda: service.add_source("obtuse", ObtuseAngle()))
    protected_call(lambda: service.add_source("local", LocalConfigSource()))
    protected_call(lambda: service.add_source("s3", S3ConfigSource()))
    protected_call(lambda: service.add_source("onedrive", OnedriveConfigSource()))
    print(f"Available sources: {service.source_names()}")
    protected_call(lambda: service.sync("obtuse", "dir1"))
    protected_call(lambda: service.sync("local", "dir1"))
    protected_call(lambda: service.sync("s3", "dir1"))
    protected_call(lambda: service.sync("onedrive", "dir1"))

protocol_abc_demo.py

import abc
from typing import Protocol


class ConfigSource(Protocol):
    @abc.abstractmethod
    def sync(self, dest: str) -> bool:
        return NotImplemented


class ObtuseAngle:
    def talk(self):
        print("I'm obtuse")


class LocalConfigSource:
    def sync(self, dest: str) -> bool:
        print(f"Syncing from local to {dest}")
        return True


class S3ConfigSource(ConfigSource):
    def sync(self, dest: str) -> bool:
        print(f"Syncing from s3 to {dest}")
        return True


class OnedriveConfigSource(ConfigSource):
    def blabula(self):
        pass


class ConfigService:
    def __init__(self):
        self._sources = {}

    def add_source(self, name: str, source: ConfigSource):
        if name in self._sources:
            raise ValueError(f"Variant {name} already exists")
        self._sources[name] = source

    def source_names(self):
        return self._sources.keys()

    def sync(self, name: str, dest: str) -> bool:
        if not name in self._sources:
            raise ValueError(f"Unknown variant {name}")
        return self._sources[name].sync(dest)


def protected_call(fn):
    try:
        fn()
    except Exception as ex:
        print(f"{type(ex).__name__}: {ex}")


if __name__ == "__main__":
    service = ConfigService()
    protected_call(lambda: service.add_source("obtuse", ObtuseAngle()))
    protected_call(lambda: service.add_source("local", LocalConfigSource()))
    protected_call(lambda: service.add_source("s3", S3ConfigSource()))
    protected_call(lambda: service.add_source("onedrive", OnedriveConfigSource()))
    print(f"Available sources: {service.source_names()}")
    protected_call(lambda: service.sync("obtuse", "dir1"))
    protected_call(lambda: service.sync("local", "dir1"))
    protected_call(lambda: service.sync("s3", "dir1"))
    protected_call(lambda: service.sync("onedrive", "dir1"))

protocol_demo.py

from typing import Protocol


class ConfigSource(Protocol):
    def sync(self, dest: str) -> bool:
        return NotImplemented


class ObtuseAngle:
    def talk(self):
        print("I'm obtuse")


class LocalConfigSource:
    def sync(self, dest: str) -> bool:
        print(f"Syncing from local to {dest}")
        return True


class S3ConfigSource(ConfigSource):
    def sync(self, dest: str) -> bool:
        print(f"Syncing from s3 to {dest}")
        return True


class OnedriveConfigSource(ConfigSource):
    def blabula(self):
        pass


class ConfigService:
    def __init__(self):
        self._sources = {}

    def add_source(self, name: str, source: ConfigSource):
        if name in self._sources:
            raise ValueError(f"Variant {name} already exists")
        self._sources[name] = source

    def source_names(self):
        return self._sources.keys()

    def sync(self, name: str, dest: str) -> bool:
        if not name in self._sources:
            raise ValueError(f"Unknown variant {name}")
        return self._sources[name].sync(dest)


def protected_call(fn):
    try:
        fn()
    except Exception as ex:
        print(f"{type(ex).__name__}: {ex}")


if __name__ == "__main__":
    service = ConfigService()
    protected_call(lambda: service.add_source("obtuse", ObtuseAngle()))
    protected_call(lambda: service.add_source("local", LocalConfigSource()))
    protected_call(lambda: service.add_source("s3", S3ConfigSource()))
    protected_call(lambda: service.add_source("onedrive", OnedriveConfigSource()))
    print(f"Available sources: {service.source_names()}")
    protected_call(lambda: service.sync("obtuse", "dir1"))
    protected_call(lambda: service.sync("local", "dir1"))
    protected_call(lambda: service.sync("s3", "dir1"))
    protected_call(lambda: service.sync("onedrive", "dir1"))