Add helpers to Flask to mimic fastapi decorators

app.py

from fast_flask import Flask

app = Flask(__name__)

@app.get("/users/")  # equivalent to `@app.route("/users/")` from flask.Flask
def get_user_details(user_id: int = 123):
    return {"123": "bob"}


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

fast_flask.py

import flask


class Flask(flask.Flask):
    def get(self, rule: str):
        return super().route(rule=rule, methods=["GET"])

    def post(self, rule: str):
        return super().route(rule=rule, methods=["POST"])

    def patch(self, rule: str):
        return super().route(rule=rule, methods=["PATCH"])

    def delete(self, rule: str):
        return super().route(rule=rule, methods=["DELETE"])