Simple Login Template in Flask

First, install the necessary packages:

pip install Flask Flask-Login Flask-SQLAlchemy Flask-Migrate Flask-Script

create an app.py file

from flask import Flask, render_template, redirect, url_for, request, flash
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
from flask_migrate import Migrate

app = Flask(__name__)

# SQLite database configuration
app.config['SECRET_KEY'] = 'secret_key'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'

db = SQLAlchemy(app)
login_manager = LoginManager()
login_manager.login_view = 'login'
login_manager.init_app(app)
migrate = Migrate(app, db)

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(150), unique=True, nullable=False)
    password = db.Column(db.String(150), nullable=False)

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        email = request.form.get('email')
        password = request.form.get('password')
        
        user = User.query.filter_by(email=email).first()

        if user and check_password_hash(user.password, password):
            login_user(user)
            return redirect(url_for('dashboard'))

        flash('Login unsuccessful. Please check email and password'…