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Just not working

I have tested this in the python shell but it is just not working here. user.email.split('@')[0][0] + '*' * len(user.email.split('@')[0][1:]) + '@' + user.email.split('@')[1] does indeed hide the email.

from flask import Flask, render_template

app = Flask(__name__)

def index():
    class User:
        email = None
    user = User()
    user.email = 'kenneth@teamtreehouse.com'
    return render_template('user.html', user=user)
{% macro hide_email(user) %}
  <p>{{ user.email.split('@')[0][0] + '*' * len(user.email.split('@')[0][1:]) + '@' + user.email.split('@')[1] }}</p>
{% endmacro %}