flask_app_context.py

app.py

from flask import Flask, Response, current_app, jsonify, make_response
from flask.views import MethodView


def create_app() -> Flask:
    """Create application context."""
    created_app = Flask(__name__)
    return created_app


app = create_app()


def _validate_app_instance() -> None:
    """Validate app instance in routes and views."""
    assert isinstance(current_app, Flask)


@app.route("/hello")
def hello() -> Response:
    """Good old hello world at work."""
    _validate_app_instance()
    return make_response("hello")


class FooApi(MethodView):
    def __init__(self, some_common_content: str, **options):
        self.content = some_common_content
        self.options = options

    def get(self) -> Response:
        """The args and kwargs all exist"""
        _validate_app_instance()
        return jsonify({"message": self.content, **self.options})


app.add_url_rule("/foo", view_func=FooApi.as_view("foo", "hello champ", can_teach=True, can_show=True))