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Python Customizing the Django Admin Customizing the List View Test: Custom Attributes

Heidi Ulrich
Heidi Ulrich
4,624 Points

How can I output total_questions right?

This is the error I get: Bummer! unsupported operand type(s) for *: 'float' and 'FakeQuiz'

I tried this in my own console, by passing in '10' or '20' as integer into the total_questions var. Works like a charm. But here, it doesn't.

Somehow, I get 'FakeQuiz' passed in, and of course that's not an integer you can calculate with.

from django.db import models
import math 

class Step(models.Model):
    title = models.CharField(max_length=255)
    description = models.TextField()
    order = models.IntegerField(default=0)

    class Meta:
        abstract = True
        ordering = ['order',]

    def __str__(self):
        return self.title

class Quiz(Step):
    total_questions = models.IntegerField()

    def number_correct_needed(total_questions):
        percentage = 0.7
        needed = int(percentage * 10)
        return "%d/%d" % (needed, total_questions)
from django.contrib import admin 

from . import models

class QuizAdmin(admin.ModelAdmin):
    list_display = ['title', 'course']

2 Answers

Kenneth Love
Kenneth Love
Treehouse Guest Teacher

That's an instance method so what should the very first argument to it be/represent?

16,414 Points


Here is my process:

def number_correct_needed(self):
      num_ques = self.total_questions  #pulled from the Quiz model
      average = ((num_ques/100)*70)

      return "{}/{}".format(math.ceil(average), math.ceil(num_ques))

I thought that I wouldn't need the math.ceil on my num_questions since that would be an int coming from the model, but this challenge requires it. Hope that helps.