Cadena de conexión para Flask & SQL Alchemy

connect.py

import urllib
import pyodbc
from flask import Flask, request, jsonify
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)

# Cadena de conexión
string_connection = "DRIVER={SQL Server};Database=DATABASE_NAME;SERVER=SERVER_NAME;UID=USER;PWD=PASSWORD"
string_connection = urllib.parse.quote_plus(string_connection)
string_connection = "mssql+pyodbc:///?odbc_connect=%s" % string_connection

app.config["SQLALCHEMY_DATABASE_URI"] = string_connection
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"]  = True
db = SQLAlchemy(app)