hello.py

from flask import Flask, render_template, session, redirect, url_for, flash
from flask_bootstrap import Bootstrap
from flask_moment import Moment
from datetime import datetime
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired
from wtforms.validators import Email

class Form(FlaskForm):
    name = StringField('What is your name?', validators=[DataRequired()])
    email = StringField('What is your UofT Email address?', validators=[DataRequired(), Email("Please include an @ in the email address.")])
    submit = SubmitField('Submit')

app = Flask(__name__)
bootstrap = Bootstrap(app)
app.config['SECRET_KEY'] = 'random string'

@app.route('/', methods=['GET', 'POST'])
def index():
    form = Form()
    if form.validate_on_submit():
        previous_name = session.get('name')
        if previous_name is not None and previous_name != form.name.data:
            flash('Looks like you have changed your name!')
        session['name'] = form.name.data
        session['email'] = form.email.data
        return redirect(url_for('index'))
    return render_template('index.html', form=form, name=session.get('name'), email=session.get('email'))