我已经开始学习Python的后端开发，特别是在Flask中.但是总是遇到新的问题
项目结构

|
 |
  -- blog
 |     -- templates
 |      |
 |       -- *html files*
 |     -- __init__.py
 |     -- DataBase.py
 |     -- routes.py
 |     -- users.db
 |     -- user.sql
 |
  -- run.py

• 内部运行. py：*

from blog import app

if __name__ == '__main__':
    app.run(debug=True)

• 在__***初始化__. py：**内部

from flask import Flask
from blog import routes

app = Flask(__name__)

• 内部数据库. py：*

import sqlite3

class DataBase:
    def __init__(self, db, schema):
        self.db = db
        self.schema = schema

    # Connect
    def get_connection(self):
        conn = sqlite3.connect(self.db)
        conn.row_factory = sqlite3.Row
        return conn

    # Initialize
    def init_db(self):
        conn = sqlite3.connect(self.db)
        with open(self.schema, 'r') as s:
            conn.executescript(s.read())

        conn.commit()
        conn.close()
    
    # Get All Data from database
    def getAllData(self):
        conn = self.get_connection()
        users = conn.execute("""SELECT * FROM users""").fetchall()

        conn.close()
        return users

• 在路线内。py：*

from blog import app
from DataBase import DataBase
from flask import render_template

data = DataBase('users.db', 'user.sql')

@app.route('/', methods=["GET"])
@app.route('/home', methods=["GET"])
def about():
    users = data.getAllData()
    return render_template('home.html', users=users)

@app.route('/team/<int:user_id>', methods=["GET"])
def members(user_id):
    if user_id == 1:
        return render_template('mirshod.html')

    elif user_id == 2:
        return "Hello World"

@app.route('/team', methods=["GET", "POST"])
def team():
    users = data.getAllData()
    return render_template('home.html', users=users)

在重组我的项目之前一切都很好，但重组后，我得到错误时，试图运行我的项目

Try 'python -m flask run --help' for help.

Error: While importing 'run', an ImportError was raised:

Traceback (most recent call last):
File "D:\\flaskMarket\\lib\\site-packages\\flask\\cli.py", line 218, in locate_app
__import__(module_name)
File "D:\\fastApiProject\\flaskProject\\run.py", line 1, in \<module\>
from blog import app
File "D:\\fastApiProject\\flaskProject\\blog\__init_\_.py", line 2, in \<module\>
from blog import routes
File "D:\\fastApiProject\\flaskProject\\blog\\routes.py", line 1, in \<module\>
from blog import app
ImportError: cannot import name 'app' from partially initialized module 'blog' (most likely due to a circular import) (D:\\fastApiProject\\flaskProject\\blog\__init_\_.py)

Process finished with exit code 2