Redirects and URL Building

from flask import Flask, redirect, url_for

app = Flask(__name__)

@app.route('/')
def index():
    return 'This is the index page.'

@app.route('/login')
def login():
    return 'This is the login page.'

@app.route('/admin')
def admin():
    return redirect(url_for('login'))

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