python Render template

[Akhou]

this is my code

    # -*- coding: utf-8 -*-
    """
    Created on Thu Apr 26 20:55:49 2018

    @author: Akhou
    """

    import string 
    v={'var1':'screen'}
    x=string.Template("""
    {
    id      :$var1
    width   :22
    height  :123
    """)
    print'Item: ', x.substitute(v)
    y="""
    {
    id      :$sm1
    x       :11
    y       :8
    width   :12
    height  :65
    } 
    """
    print 'Rectangle ' , y%v

now I want to generate a .qml file from it. So I looked on line for an example to follow( atleast to understand the concept) I found that rebder template is able to generate/create a .qml file. I tried this example ( just to understand how it (rendered_teplate) work :

    from flask import Flask, render_template
    from flask import request, jsonify
    app = Flask(__name__)
    @app.route('/', methods=['GET', 'POST'])
    def homepage():
       if request.method == 'POST':
           f1 = request.form['firstVerb'] 
           f2 = request.form['secondVerb']
       return render_template('index.html', f1=f1, f2=f2)

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

All I got was that text :

Error:
 * Restarting with stat