Flask wtf_forms with RadioField for star ratings system

radio.py

from flask import Flask, render_template
from flask_wtf import FlaskForm
from wtforms import RadioField


SECRET_KEY = 'development'


app = Flask(__name__)
app.config.from_object(__name__)
class SimpleForm(FlaskForm):
    rating = RadioField(
        label='Your Rating',
        coerce=int,
        choices=[('1', '1'), ('2', '2'), ('3', '3'), ('4', '4'), ('5', '5')])


@app.route('/',methods=['post','get'])
def hello_world():
    form = SimpleForm()
    if form.validate_on_submit():
        print(form.rating.data)
    else:
        print(form.errors)
    return render_template('example.html',form=form)


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