Dependency Injection: A Python Flask Example

di.py

from flask import Flask

class DAO:
    def __init__(self):
        self.data = []

def App(dao):

    app = Flask("example")

    @app.route("/")
    def m():
        return dao.data

    return app

if __name__ == "__main__":
    app = App(DAO())
    app.run()

no_di.py

from flask import Flask

app = Flask("example")

class DAO:
    def __init__(self):
        self.data = []

dao = DAO()

@app.route("/")
def m():
    return dao.data

if __name__ == "__main__":
    app.run()