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') ... person.health = 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() >>> person.health = 20 >>> assert person.cure == syrup >>> person.drink_medicine() Nom nom >>> assert person.health == 100
Mocking
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)
Installing
The package can be installed from the cheese shop by typing:
pip install syringe
Project details
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