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Python Flask Basics Character Builder Loop Nested Items

Chastin Davis
PLUS
Chastin Davis
Courses Plus Student 2,299 Points
Posted by Chastin Davis
Chastin Davis
Courses Plus Student 2,299 Points

isnt this the answer???

Why is this not working???

flask_app.py 
from flask import Flask, render_template

from teachers import TEACHERS

app = Flask(__name__)


@app.route('/')
def index():
    return render_template("teachers.html", teachers=TEACHERS)
templates/teachers.html 
<ul class="teachers">
{% for teacher in teachers %}
  <li>
    <h2>{{teacher['name']}}</h2>
    <ul class ="courses">
      {% for course in courses %}
      <li>
        {{ teacher['course'] }}
      </li>
      {% endfor %}
    </ul>
  </li>
  {% endfor %}
</ul>