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from flask import Flask, render_template, request, redirect, url_for

app = Flask(__name__)

# Dummy user credentials for demonstration
users = {'username': 'password'}

@app.route('/')
def home():
    return render_template('login.html')

@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')

    if username in users and users[username] == password:
        return f'Welcome, {username}!'
    else:
        return 'Invalid login. Please try again.'

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



<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
</head>
<body>
    <h2>Login</h2>
    <form method="post" action="/login">
        <label for="username">Username:</label>
        <input type="text" id="username" name="username" required><br>
        <label for="password">Password:</label>
        <input type="password" id="password" name="password" required><br>
        <input type="submit" value="Login">
    </form>
</body>
</html>
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