faced this while trying to upgrade a django 1.8 project to django 2.2/3.0 about django-enumfields HOT 8 CLOSED

    class Labels:
        RED = 'A custom label'

    labels = {
        RED: 'A custom label'
    }

labels = {
    DEFAULT: 'Default Landing Template',
}

labels = {
    DEFAULT: 'Default SMS Template',
}

labels = {
    DEFAULT: 'Default Email Template',
    BLANK: 'Blank Email Template',
}

COLOR_CHOICES = [
    ('FF0000', 'Red'),
    ('FFAA00', 'Orange'),
    ('FFFF00', 'Yellow'),
    ('91C43B', 'Green'),
    ('0000FF', 'Blue'),
    ('00FFFF', 'Purple'),
]

# Basic
name = models.CharField(max_length=64, unique=True)
category = models.CharField(
    max_length=64,
    choices=CATEGORY_CHOICES,
    null=True,
    blank=True,
    db_index=True,
)

mask = models.ForeignKey(
    'gallery.Mask',
    null=True, blank=True,
    on_delete=models.CASCADE,
)

# Templates
landing_template = enum.EnumField(
    LandingTemplate,
    default=LandingTemplate.DEFAULT,
)
sms_template = enum.EnumField(SMSTemplate, default=SMSTemplate.DEFAULT)
email_template = enum.EnumField(
    EmailTemplate,
    default=EmailTemplate.DEFAULT,
)

video_template = models.CharField(
    max_length=128,
    default='default',
    choices=VIDEO_TEMPLATE_CHOICES,
)

# Photo taking parameters in the mobile application
min_count = models.PositiveSmallIntegerField(default=0)
max_count = models.PositiveSmallIntegerField(default=6)
default_count = models.PositiveSmallIntegerField(default=4)

color = models.CharField(
    max_length=16, choices=COLOR_CHOICES,
    blank=True, null=True
)

class Meta:
    verbose_name = 'campaign type'
    verbose_name_plural = 'campaign types'

def __str__(self):
    return self.name

@property
def landing_template_name(self):
    return LandingTemplate.name(self.landing_template).lower()

def render(self, prefix, context={}):
    fields = {
        'sms': 'sms_template',
        'email': 'email_template',
        'landing': 'landing_template',
    }
    if prefix not in fields:
        raise ValueError('Prefix {} is not allowed'.format(prefix))
    field_name = fields[prefix]
    template_name = self._meta.get_field(field_name)\
        .enum.name(getattr(self, field_name)).lower()
    template = get_template('{}/{}.jinja'.format(prefix, template_name))
    return template.render(context)

class Meta(Sortable.Meta):
    unique_together = [
        ('type', 'name'),
        ('type', 'title'),
    ]

def __str__(self):
    return self.title

class labels:
    DEFAULT = 'Default Landing Template'

class labels:
    DEFAULT = 'Default SMS Template'

class levels:
    DEFAULT = 'Default Email Template'
    BLANK = 'Blank Email Template'