import time

from flask import Flask, request, render_template

​

app = Flask(__name__)

​

@app.route('/', methods=["GET", "POST"])

def index():

    username = None

    value = 0

    if request.method == 'POST':

        username = request.form.get("username", None)

​

    def calculate_value_based_on_username(user_given_name):

        time.sleep(10)

        return len(user_given_name)

​

    if username:

        value = calculate_value_based_on_username(username)

        return render_template('app.html', username=username, value=value)

    return render_template('app.html')

​

if __name__ == '__main__':

    app.run(debug=True)