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class MaskedCreditCardField(models.CharField): def __init__(self, *args, **kwargs): kwargs['max_length'] = 20 super().__init__(*args, **kwargs) def to_python(self, value): if not isinstance(value, str): raise ValidationError("The card number must be a string") if not value.isdigit(): raise ValidationError("The card number must contain only digits") if len(value) != 16: raise ValidationError("The card number must be exactly 16 characters long") return f"****-****-****-{value[-4:]}" class CreditCard(models.Model): card_owner = models.CharField(max_length=100) card_number - MaskedCreditCardField()
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