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Django choices. How to set default option?

How to set default STATUSES option ?

class Order(models.Model):
    STATUSES = (
        (u'E', u'Expected'),
        (u'S', u'Sent'),
        (u'F', u'Finished'),
    )

    status = models.CharField(max_length=2, null=True, choices=STATUSES)
question from:https://stackoverflow.com/questions/12725720/django-choices-how-to-set-default-option

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status = models.CharField(max_length=2, null=True, choices=STATUSES, default='E')

or to avoid setting an invalid default if STATUSES changes:

status = models.CharField(max_length=2, null=True, choices=STATUSES, default=STATUSES[0][0])

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