better_way.py

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/<page_name>')
@app.route('/', defaults={'page_name': 'index'})
def page(page_name):
    return render_template(page_name, {'page_name': page_name})

with_loop.py

from flask import Flask, render_template

app = Flask(__name__)

pages = ['index', 'about', 'contact']

for page in pages:
    @app.route('/' + page, endpoint=page)
    # actually bind the current name to this throwaway
    def tossaway(page=page):
        return render_template(page, {'page_name': page})