Python + Dependency Injection 💉🐍 | Part 1
Dependency injection is a design pattern in which components are given their dependencies instead of creating or looking for them. In Python, dependency injection can be employed to make code more modular, testable, and maintainable.
There are several ways to implement dependency injection in Python, and one popular method is using the injector library. The injector library provides a simple and flexible way to manage dependencies in Python projects.
Installing the Injector Library
To get started with dependency injection in Python, you first need to install the injector library. You can do this using pip:
pip install injector
Creating a Simple Example
Let’s create a simple example to demonstrate how dependency injection works in Python with the injector library. Suppose we have a class UserService that depends on a UserRepository class:
class UserRepository:
def get_user(self, user_id):
# code to fetch user from the database
pass
class UserService:
def __init__(self, user_repository):
self.user_repository = user_repository
def get_user(self, user_id):
return self.user_repository.get_user(user_id)
In this example, the UserService class has a dependency on the UserRepository class. We will use dependency injection to provide the UserRepository instance to the UserService class.
Stay tuned for Part 2, where we will show you how to use the injector library to manage dependencies in this example!
