simple_server.py

#!/usr/bin/python

from flask import Flask, request
app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def home():
    text = None
    if request.method == 'POST':
        if request.form['submit']:
            text = "%s" % request.form['submit']
            text = request.form['text']
    page = """<h1>Flask Test Server</h1>
<form name='main' method='post'>
<p>
  Enter Text: <input type='text' name='text'>
  <input type='submit' value='submit' name='submit'>
</p>"""

    if text:
        return "%s<h2>%s</h2>" % (page, text)

    return page

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