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A simple dependency injection library

Project Description

A simple dependency injection library.

Usage example

First decorate a class with @provides('a lookup name').

>>> import syringe
>>> @syringe.provides('cure')
... class Syrup:
...     def drink(self, person):
...         print('Nom nom')
... = 100

Instantiate it. Note that it is not possible to instanciate another instance of a class decorated with the name cure.

>>> syrup = Syrup()

Next inject it in another class using inject('a lookup name').

>>> class Person:
...     cure = syringe.inject('cure')
...     def drink_medicine(self):
...         self.cure.drink(self)

When an instance of the Person class is created, the value of the injecte name is the instance of the provided and instantiated class.

>>> person = Person()
>>> = 20
>>> assert person.cure == syrup
>>> person.drink_medicine()
Nom nom
>>> assert == 100


A mock instance can be inserted using syringe.mock('a lookup name')

>>> try:
...     from unittest import mock
... except:
...     import mock
>>> m = syringe.mock('cure')
>>> person.drink_medicine()
>>> m.drink.assert_called_once_with(person)


The package can be installed from the cheese shop by typing:

pip install syringe

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