вы можете создать user.py и импортировать mysql и приложение
users.py
from app import mysql
import app
from flask import Blueprint, render_template, abort
users_bp = Blueprint('users_bp', __name__)
@users_bp.route('/register', methods=["GET", "POST"])
def register():
# USE BD
sQuery = "INSERT INTO user (mail, password, name) VALUES (%s, %s, %s)"
cur = mysql.connection.cursor()
cur.execute(sQuery, (mail, password, name))
mysql.connection.commit()
зарегистрировать план в основном приложении: -
from users import users_bp
app.register_blueprint(users_bp, url_prefix='/users')