Injkt (Dependency injection injktion)

Your simple python DI library built with good intentions.

Install

pip install injkt

Why?

Good question.

How?

import typing as ty

from injkt import Bind, Config, Injectable, Injktor, inject_args_deps


class IMailService(ty.Protocol):
    def send_mail(self, subject: str, to: str) -> None:
        ...


class SmtpMailService(IMailService):
    def send_mail(self, subject: str, to: str) -> None:
        raise NotImplementedError()


injktor = Injktor(
    Config(
        {
            Bind(IMailService, SmtpMailService),
        }
    )
)


@inject_args_deps
def business_logic(mail_service=Injectable(IMailService)):
    mail_service.send_mail("Hello", "world")


business_logic()

Class Based

from injktor import inject_attr_deps

@inject_attr_deps
class BusinessLogic:
    mail_service = Injectable(IMailService)

    def do_business_logic(self) -> None:
        self.mail_service.send_mail("Hello", "world")


BusinessLogic().do_business_logic()

Class based lazy injection

from injktor import InjktLazy

class BusinessLogic(InjktLazy):
    mail_service = Injectable(IMailService)

    def do_business_logic(self) -> None:
        self.mail_service.send_mail("Hello", "world")


BusinessLogic().do_business_logic()

Re-init dependencies

injktor = Injktor(
    Config(
        {
            Bind(IMailService, SmtpMailService, always_reinit=True),
        }
    )
)

Enabling always_reinit will re-initialize the dependency on each call. NOTE: It won't be re-initialized in the same class if you aren't using InjktLazy