Simple Flask Login

Simple Flask Login
Flask-Login module It provides user session management for Flask: logging in, logging out, and remembering session. 

The module stores the user ID, restricts views to logged in users, protects cookies and has many other features.
https://flask-login.readthedocs.io/en/latest/
app.py

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from flask import Flask, redirect from flask_sqlalchemy import SQLAlchemy from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user #ModuleNotFoundError: No module named 'flask_sqlalchemy' = (venv) C:\flaskmyproject>pip install Flask-SQLAlchemy #ModuleNotFoundError: No module named 'flask_login' = (venv) C:\flaskmyproject>pip install flask_login   #import sqlite3    app = Flask(__name__) #conn = sqlite3.connect('flask_login.db') #print("Opened database successfully");   app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///flask_login.db' app.config['SECRET_KEY'] = 'cairocoders-ednalan'    db = SQLAlchemy(app) login_manager = LoginManager() login_manager.init_app(app)   class User(UserMixin, db.Model):     id = db.Column(db.Integer, primary_key=True)     username = db.Column(db.String(30), unique=True)       @login_manager.user_loader def load_user(user_id):     return User.query.get(int(user_id))   @login_manager.unauthorized_handler def unauthorized_callback():     return redirect('/login')       @app.route('/') def index():     return 'Public Page'       @app.route('/login') def login():     user = User.query.filter_by(username='cairocoders').first()     login_user(user)     return 'You are now logged in!'       @app.route('/home') @login_required def home():     return 'The current user is ' + current_user.username     @app.route('/profile') @login_required def profile():     return 'profile page'       @app.route('/logout') @login_required def logout():     logout_user()     return 'You are now logged out!'       if __name__ == '__main__':  app.run(debug=True)