Filter Django user permissions from admin

admin.py

"""
Si el usuario pertenece a uno o varios grupos y estos grupos tienen permisos, no muestres estos permisos en el campo para asignar permisos individuales en django admin
"""
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from django.contrib.auth.models import Group, Permission

class UserAdmin(BaseUserAdmin):    

    def get_form(self, request, obj=None, **kwargs):
        
        form = super(UserAdmin, self).get_form(request, obj, **kwargs)
        
        if 'user_permissions' in form.base_fields and obj:
            groups = obj.groups.values_list('id',flat=True)
            gname = []
            for g_id in groups:
                gp = Permission.objects.filter(group__id__in=[g_id])
                for p in gp:
                    gname.append(p.codename)
            permissions = form.base_fields['user_permissions']
            permissions.queryset = permissions.queryset.exclude(codename__in=gname)

        return form