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If you want to get list of users by permission, look at this variant:
from django.contrib.auth.models import User, Permission
from django.db.models import Q
perm = Permission.objects.get(codename='blogger')
users = User.objects.filter(Q(groups__permissions=perm) | Q(user_permissions=perm)).distinct()
This would be the easiest
from django.contrib.auth import models
group = models.Group.objects.get(name='blogger')
users = group.user_set.all()