Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Flask Basics Character Builder Loop Nested Items

Nested loops confusing me

How do I nest a 'for' loop in jinja syntax? Should I type{{% for item in items %}} twice?

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 item in teachers %}
  <li>    
   <h2>{{item.name}}</h2> 
   <ul class='courses'>
      {% for item in courses %}
        <li>{{item.name}}</li>
      {% endfor %}
    </ul> 
  </li>
  {% endfor %}
</ul>

2 Answers

Greetings Ngqabutho!

Great job so far! You can definitely keep on nesting those for loops, but if you are naming everything {% item in ____ %} it could get a bit confusing. So the first thing I recommend is saying something like {% for teacher in teachers %}, {% for student in students %}, etc.

So for this part of the challenge you are asked to iterate through the teacher's 'courses' key. You have already done this for the 'name' key by saying {{ teacher.name }}. Now to access the course key in the for in loop you need to iterate for course in teacher.courses (can also be done as teacher['courses']) Then in your li tags we want course to be printed (course.name will not work because name is a key for teacher) so a simple {{ course }} will work!

Hope this helps and happy coding! 💚💚💚

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there, Ngqabutho Moyo! The problem with the nested loop really is that you are re-defining item. This is going to confuse things :smiley: I would suggest using separate variables in the for loops. Like for teacher in teachers and for course in teacher.courses.

Hope this helps! :sparkles: