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1class Order(models.Model):
2customer = models.ForeignKey(User, on_delete=CASCADE)
3status = models.CharField(choices=Status.choices)
4created_at = models.DateTimeField(auto_now_add=True)
5
6@property
7def total(self):
8return self.items.aggregate(Sum(F('qty') * F('price')))

Not toy examples. Real models.

Django, DRF, Python — multi-file editor, runs instantly

87/100
Correct ForeignKey with CASCADE
TextChoices for status validation
Use DecimalField for money, not Float
Clean __str__ method

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Most platforms teach pattern matching. Codetail builds problem-solving intuition through real-world practice and AI feedback.

01

Pick a path

Python fundamentals, Django models, REST Framework. Each path is a curated sequence of real-world challenges.

02

Write real code

Full code editor with syntax highlighting. Multi-file support for Django. Run against test cases instantly.

03

Get AI feedback

AI reviews your code like a senior developer. Strengths, issues, next steps. Learn the why behind every pattern.

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50+ curated challenges. AI that reviews every line. Progress you can see.