How do you apply dependency injection (DI) in Python without a heavy framework?

Problem Statement

Explanation

Pass interfaces or callables into constructors or function parameters. Build the object graph at startup in a small composition root. Use factories for resources like clients or repositories. This keeps modules decoupled and testable. In tests, swap real dependencies for fakes by passing different constructors or using monkeypatch.

Code Solution

SolutionRead Only

class Service:
    def __init__(self, repo): self.repo=repo

def build():
    repo = SqlRepo(url)
    return Service(repo)

Practice Sets

This question appears in the following practice sets:

System Design & Best Practices

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How do you apply dependency injection (DI) in Python without a heavy framework?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

How do you apply dependency injection (DI) in Python without a heavy framework?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Is Python compiled, interpreted, or both?

Which of these joins two lists to make one new list?

Which loop runs until a condition becomes false?

Which method gives the floor value of a float?

In Python, what is the difference between '/' and '//'?

More from Python

Master Interviews
Anywhere, Anytime