Source Code: https://github.com/l1onsun/snake_di
Features:
- Lightweight - no external dependencies (only
typing_extensions) - Based on type annotations - no configuration required, less boilerplate
- Overridable - simple and flexible override system
- Pytest integration - writing unit tests was never so easy!
yeildpowered - justyeildyour component and then write closing stepsasyncsupport - able to work withasyncresources
pip install snake-di
- Documentation
- Pytest fixtures support
- Selective builds - allow build only necessary components
- More helpful exception messages
- Scopes - reuse factories for different app configurations
file_manager.py
@dataclass
class FileManager:
opened_file: typing.TextIO
def do_some_file_work(self):
...
@dataclass
class Settings:
file_name: strprovider.py
from snake_di import Provider
provider = Provider()
@provider.include_factory
def provide_settings() -> Settings:
return Settings(file_name="some.txt")
@provider.include_factory
def provide_file(settings: Settings) -> TextIO:
with open(settings.file_name) as file:
yield file
@provider.include_factory
def provide_file_manager(opened_file: TextIO) -> FileManager:
return FileManager(opened_file)main.py
def main():
with provider.build() as container:
assert container.keys() == {Settings, TextIO, FileManager}
file_manager = container[FileManager]
file_manager.do_some_file_work()
assert container[TextIO].closed is False
assert container[TextIO].closed is TrueOverride example - Multiple providers:
@Provider.from_factory
def change_settings() -> Settings:
return Settings(file_name="other.txt")
@Provider.from_factory
def mock_file() -> TextIO:
return unittest.mock.Mock()
def main():
assert type(mock_file) is type(change_settings) is Provider
assert type(provider | mock_file | change_settings) is Provider
with (provider | mock_file | change_settings).build() as container:
assert container[Settings].file_name = "other.txt"
assert type(container[FileManager].opened_file) is unittest.mock.MockIntegration with pytest example:
from snake_di.pytest import pytest_provide
@pytest.fixture
def any_usual_fixture():
return ...
@pytest_provide(provider | mock_file)
def test_with_mocked_file(
file_manager: FileManager,
mocked_file: typing.TextIO,
any_usual_fixture
):
assert type(mocked_file) is unittest.mock.Mock
assert file_manager.opened_file == mocked_fileContainer.partial_solve() example
def handle_data(file_manager: FileManager, settings: Settings, data: str):
...
def main():
with provider.build() as container:
handle_data_solved = container.partial_solve(handle_data)
handle_data_solved(data="data")