auto-init 0.0.1

Class With auto-init

from auto_init import auto_init_class

@auto_init_class
class Point:
    x: int
    y: int

p = Point(y=-5)
assert p.x == 0
assert p.y == -5
assert str(p) == '<Point x=0, y=-5>'

You Can Still Have Your __init__

@auto_init_class
class Point:
    x: int
    y: int

    def __init__(self, *args):
        if args:
            self.x, self.y = args

Singletons

@auto_init_class(singleton=True)
class AppModel:
    pass

@auto_init_class
class AppPresenter:
    model: AppModel

@auto_init_class
class AppView:
    model: AppModel

@auto_init_class
class App:
    model: AppModel
    view: AppView
    presenter: AppPresenter

app = App()
assert isinstance(app.view.model, AppModel)
assert app.view.model is app.presenter.model

Access to the Base Class

@auto_init_class
class Point:
    x: int
    y: int


primitive_point = Point(auto_init_base=True)
initialised_point = Point(x=10)

assert isinstance(primitive_point, Point._auto_init_base)
assert not hasattr(primitive_point, 'x')

assert isinstance(initialised_point, Point)
assert initialised_point.x == 10

Context

Context allows setting custom providers.

from auto_init import AutoInitContext, auto_init_class

@auto_init_class
class Line:
    start: Point
    end: Point

context = AutoInitContext(providers={Point: Point3d})

with context:
    assert isinstance(Point(), Point3d)
    assert isinstance(Line().start, Point3d)

Also, singletons apply only to the current context.

Inheritance Works

@auto_init_class
class Point:
    x: int
    y: int

@auto_init_class
class Point3d(Point):
    z: int