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If the choices are going to change, use a separate model for the type. That will give you a lot more flexibility.
class Industry(models.Model):
type = ForeignKey('IndustryType')
...
class IndustryType(models.Model):
type_name = models.CharField(max_length=30)
def __str__(self): # use __unicode__ for Python 2
return self.type_name
The Industry admin form will put a green + next to the type dropdown. That will let you add a new type, which will be added to the dropdown.
Source:stackexchange.com