Use below code
from django.contrib.auth.models import Group, Permission
from django.contrib.contenttypes.models import ContentType
from api.models import Project
new_group, created = Group.objects.get_or_create(name="new_group")
# Code to add permission to group ???
ct = ContentType.objects.get_for_model(Project)
# Now what - Say I want to add 'Can add project' permission to new_group?
permission = Permission.objects.create(codename="can_add_project",
name="Can add project",
content_type=ct)
new_group.permissions.add(permission)