将我的 signals.py 文件保存在 Django 元素中的正确位置

根据我阅读的Django文档，APP文件夹中的signals.py似乎是一个很好的起点，但我面临的问题是，当我为pre_save创建信号时，我试图从模型导入类时，它与我的模型中的import冲突.

# models.py

from django.contrib.auth.models import User
from django.db import models
from django.utils.translation import gettext as _
from signals import *

class Comm_Queue(CommunicatorAbstract):
    queue_statuses = (
        ('P', _('Pending')),
        ('S', _('Sent')),
        ('E', _('Error')),
        ('R', _('Rejected')),
    )
    status          = models.CharField(max_length=10, db_index=True, default='P')
    is_html         = models.BooleanField(default=False)
    language        = models.CharField(max_length=6, choices=settings.LANGUAGES)
    sender_email    = models.EmailField()
    recipient_email = models.EmailField()
    subject         = models.CharField(max_length=100)
    content         = models.TextField()

# signals.py

from django.conf import settings
from django.db.models.signals import pre_save
from django.dispatch import receiver
from models import Comm_Queue

@receiver(pre_save, sender=Comm_Queue)
def get_sender_email_from_settings(sender, **kwargs):
    obj=kwargs['instance']
    if not obj.sender_email:
        obj.sender_email='%s' % settings.ADMINS[0][1]

这段代码不会运行，因为我在signals.py内部导入了Comm_Queue，也在models.py内部导入了信号.

有谁能建议我如何克服这个问题吗？

致以问候