ImportError: cannot import name ‘app’ from partially initialized module ‘market’ (most likely due to a circular import)

I was trying to package my code as it was getting kind of complex for me to keep in one file and i encountered an import error when i tried to run the file that says circular import error, how do i solve this error? I have been analyzing the code and i cannot seem to be able to figure out what might be wrong.

run.py

from market import app

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

init.py

from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
from market import routes

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///market.db"
db = SQLAlchemy(app)

routes.py

from market import app
from flask import render_template
from market.models import Item


@app.route("/")
@app.route("/home")
def home():
    return render_template("index.html")


@app.route("/market")
def market():
    items = Item.query.all()
    return render_template("market.html", items=items)

models.py

from market import db


class Item(db.Model):
    id = db.Column(db.Integer(), primary_key=True)
    name = db.Column(db.String(length=30), nullable=False, unique=True)
    price = db.Column(db.Integer(), nullable=False)
    barcode = db.Column(db.String(length=12), nullable=False, unique=True)
    description = db.Column(db.String(length=1024), nullable=False, unique=True)

    def __repr__(self):
        return f"Item {self.name}"

project structure

error

Answer

Moving your routes import to the bottom of the file should help.

Just as you would do for example with blueprints in application factory. You import blueprints/views after you create app instance with app = Flask(__name__):

def create_app(config_filename):
    app = Flask(__name__)
    app.config.from_pyfile(config_filename)

    from yourapplication.model import db
    db.init_app(app)

    
    from yourapplication.views.admin import admin
    from yourapplication.views.frontend import frontend
    app.register_blueprint(admin)
    app.register_blueprint(frontend)

    return app

Also check: Is a Python module import at the bottom ok?