Django dict key,value in for loop does not work

Question

I'm getting a little stuck on a Django problem where I can't access the values of a dict in a for loop. It works outside the for loop, just not inside.

Am I missing the obvious here?

Python:

err{}
err['else'] = {'class': 'Low', 'txt': 'zero'}
err['if'] = {'class': 'High', 'txt': 'one'}
data = { 'errors': err }
return render(request, 'index/error.html', data)

HTML template:

<p>{{ errors }}</p>
<p>{{ errors.if }}</p>
<p>{{ errors.if.class }}</p>

{% for error in errors %}
  <div class="{{ error.class }}"><p>{{ error.txt }}</p></div>
{% endfor %}

The upper 3 lines are for code debugging and work just fine. The for loop doesn't produce any code.

Best regards, LVX

Answer 1

You probably need to access .items() of the dict that you called errors . Just iterating over a dict gives you the keys, but not the values.

You can change your code to:

{% for k, v in errors.items %}
  <div class="{{ v.class }}"><p>{{ v.txt }}</p></div>
{% endfor %}

---

Of course, if you don't need the keys ( if and else ) then you could also use .values() instead of items() to just get the values inside the dict .

Answer 2

The answer by Ralf is sufficient for the question, I just want to add an extra piece of information here.

When the template system encounters a dot in a variable name, it tries the following look-ups, in this order:

1. Dictionary Lookup (eg: foo['bar'])
2. Attribute Lookup (eg: foo.bar)
3. Method Call (eg: foo.bar())
4. List-Index Lookup (eg: foo[2])

The system uses the first lookup type that works.

Answer 3

You should try like this - error['class']

Second way - error[key]['class']

Use forloop - for k,v in errors: print(v['class'])