Python Django模型：init.py导入错误

因此，我有一个普通的DJango项目，有一些附加组件：

• Django Oauth工具包
• Django Rest框架
• 科尔斯

所以它一直在工作，直到我开始在Rest框架视图集中创建自定义“检索”请求。为了提供帮助，回溯如下：

Traceback (most recent call last):
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 195, in fetch_command
    klass = load_command_class(app_name, subcommand)
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 39, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 13, in <module>
    from django.core.servers.basehttp import get_internal_wsgi_application, run
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 17, in <module>
    from django.core.handlers.wsgi import ISO_8859_1, UTF_8
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 10, in <module>
    from django import http
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/http/__init__.py", line 5, in <module>
    from django.http.response import (
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/http/response.py", line 13, in <module>
    from django.core.serializers.json import DjangoJSONEncoder
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/serializers/__init__.py", line 23, in <module>
    from django.core.serializers.base import SerializerDoesNotExist
  File "/Users/Mason/Documents/dev/DIRNAME/SERCETDIR/env/lib/python2.7/site-packages/django/core/serializers/base.py", line 4, in <module>
    from django.db import models
  File "/Users/Mason/Documents/dev/DIRNAME/SECRETDIR/env/lib/python2.7/site-packages/django/db/models/__init__.py", line 3, in <module>
    from django.db.models import signals  # NOQA
ImportError: cannot import name signals

---

`

您是从

manage.py runserver

开始使用ti的吗？另外，

settings.py

（删除个人信息）和django版本（我们可以从您的错误中猜出python版本）是任何人都必须提供帮助的<代码>从django.db.models导入信号在我最新的dajngo（1.10）上完美运行。是的，我正在Mac上使用“/manage.py runserver”检查模型的循环导入。类似于在第一个应用程序中导入Model2，在第二个应用程序中导入ModelOne。@andrey shipilov尝试了这种方法，取出了任何可能有循环但仍然不起作用的东西！：（您收到的错误很可能是循环导入。您可以共享您模型的一些代码吗？您是从

manage.py runserver

开始ti的吗？还有

settings.py

（删除个人信息）和django版本（我们可以从您的错误中猜出python版本）任何人都必须提供帮助。

来自django.db.models import signals

使用最新的dajngo（1.10）对我来说非常有效。是的，我在Mac电脑上使用“/manage.py runserver”检查您的模型是否循环导入。类似于在第一个应用程序中导入Model2，在第二个应用程序中导入ModelOne。@andrey shipilov尝试了一下，取出了任何可能有循环的东西，但仍然不起作用！：（您得到的错误很可能是循环导入。您能分享一些模型的代码吗？

from __future__ import unicode_literals

import string
import uuid
from datetime import timedelta, datetime
from random import randint

from django.contrib.auth.models import User, Group
from django.db import models
from django.utils.crypto import random
from django.utils.html import format_html
from helpers import fields # Doesn't import this file


class CardHolder(models.Model):
    user = models.ForeignKey(User, related_name='rest_framework')
    card_number = fields.CardNumberField(unique=True, max_length=16)  # My special field
    authentication_code = models.IntegerField()
    transaction_auth_code = models.BigIntegerField()
    universal_user_id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    client_sign_up_key = models.CharField(max_length=20, default="hi")

    def generate_attr(self):
        self.authentication_code = randint(0, 2147483647)  # 2147483647 is IntegerFields top limit
        self.transaction_auth_code = randint(0, 9223372036854775807)
        self.card_number = generate_card_number(max_length=16, min_length=16)

    def __str__(self):
        return self.user.username

    def client(self):
        try:
            if len(self.user.groups.all()) > 0:
                user_group = self.user.groups.all().last()
                print "Here: ", self.user, ' ', user_group
                client = Client.objects.get(name=user_group.name)
                print client
                universal_client_id = client.universal_client_id
                client_url = "/admin/{}/client/{}/change".format(self._meta.app_label, universal_client_id)
                return format_html("<span><a href='{}'>{}</a></span>".format(client_url, client.name))
            else:
                return "No Clients :("
        except Exception as e:
            raise e

    def generate_client_sign_up_key(self):
        size = 20
        chars = string.ascii_uppercase + string.digits
        code = ''.join(random.choice(chars) for _ in range(size))
        self.client_sign_up_key = code
        self.save()
        return code


client_image_choices = (
    ('SQ', 'Square'),
    ('RC', 'Rectangle'),
    ('RO', 'Round')
)


class Client(models.Model):
    temp = False

    name = models.CharField(max_length=500, default="NAME")
    email = models.EmailField(default="sam@themasons.org")

    colour_style = models.CharField(default="ff0000", max_length=8, help_text="Please remove any # from the front")
    icon = models.FileField(default="logo.png", help_text="If you can, please upload a square/round icon, not a big "
                                                          "rectangular shape.")
    image_shape = models.CharField(max_length=20, choices=client_image_choices)

    website = models.URLField(max_length=500, default="https://example.com/")
    request_url_segment = models.CharField(max_length=500, default="api/request")
    login_url_segment = models.CharField(max_length=500, default="api/login")
    universal_client_id = models.UUIDField(primary_key=True, editable=True, default=uuid.uuid4)
    description = models.CharField(max_length=500, default="HI")
    admin = models.ForeignKey(User, default=1)

    active = models.BooleanField(default=True)
    deleted = models.BooleanField(default=False)
    deletion_key = models.CharField(max_length=20)

    def create_random_key(self, term_length, do_return_object):
        random_key = randint(0, 9999999999999999)
        date_time_created = datetime.now
        random_key_object = ClientRandomKey(client=self, random_key=random_key, date_time_created=date_time_created,
                                            valid_term_length=term_length)
        random_key_object.save()

        if do_return_object:
            return random_key_object

    def is_active(self):
        return self.active

    def delete(self, using=None, keep_parents=False):
        group = Group.objects.get(name=self.name)
        group.delete()
        super(Client, self).delete()

    def __str__(self):
        return "{}".format(self.name)

    def transactions_for_client(self):
        transactions_for_client = TransactionLogItem.objects.filter(client=self)
        return transactions_for_client

    def generate_deletion_key(self):
        size = 20
        chars = string.ascii_uppercase + string.digits
        code = ''.join(random.choice(chars) for _ in range(size))
        self.deletion_key = code
        self.save()
        return code


class TransactionLogItem(models.Model):
    expiry_length = 100  # In days

    client = models.ForeignKey(Client)
    card_holder = models.ForeignKey(CardHolder)
    name = models.CharField(max_length=500, default="A transaction")
    date_created = models.DateTimeField()
    visible = models.BooleanField(default=True)

    def make_invisible(self):
        print "here"
        self.visible = False
        self.save()

    def get_client(self):
        return Client.objects.get(universal_client_id=self.client.universal_client_id)

    def __str__(self):
        return "Transaction for {}".format(self.card_holder)


class ClientRandomKey(models.Model):
    client = models.ForeignKey(Client)
    random_key = models.BigIntegerField()
    date_time_created = models.DateTimeField(auto_now_add=True)
    valid_term_length = models.IntegerField()  # Number of days that the Key is valid for.

    def get_finishing_date(self):
        start_date_time = self.date_time_created
        valid_term_length = self.valid_term_length

        finish_date = start_date_time + timedelta(days=valid_term_length)
        return finish_date

    def is_valid(self):
        if self.get_finishing_date() == datetime.now() or self.get_finishing_date() < datetime.now():
            return False
        else:
            return True

    def __str__(self):
        return "Random Key for: {}".format(self.client)


    def generate_card_number(**kwargs):
        """
        Generates card number, used definitely in CardHolder.generate_attr()

        :param kwargs:
        :return:
        """
        try:
            max_length = kwargs["max_length"]
            min_length = kwargs["min_length"]

            value = []
            if max_length >= min_length:
                if max_length % 4 == 0:
                    segment_length = max_length / 4

                    for s in range(segment_length):
                        segment = random.randint(1000, 9999)
                        value.append(segment)

                    temp_value_str = map(str, value)
                    temp_value_parsed = "".join(temp_value_str)

                    return temp_value_parsed
                else:
                    return None
            else:
                raise ValueError("min_length is greater than max_length")
        except Exception as e:
            raise e