[Python] I intend to exempt 0 as a valid value in a positive integer field in django

class Sales(models.Model):
customer = models.ForeignKey(Customer, null=True, on_delete= models.SET_NULL)
quantity = models.PositiveIntegerField(default=0)
goods_Pending = models.BooleanField()

1. I would like to exempt 0 as a valid response in the Positive Integer Field

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