突然出现“没有名为models的模块”

Question

我有一个项目，里面有三个应用，分别叫做 projects、specimens 和 tests。之前一切都运行得很好，直到我做了一个改动（我不记得具体是什么了）。之后，Django 就报错了，提示 ImportError: No module named models. 我想不明白问题出在哪里，因为我觉得我的引用和组织都很正确。

这是我遇到的错误：

ImportError at /

No module named models

Request Method:     GET
Request URL:    http://127.0.0.1:8000/
Django Version:     1.5.5
Exception Type:     ImportError
Exception Value:    

No module named models

Exception Location:     /home/david/mysqldb/dev/mysqldb/teams_db/specimens/views.py in <module>, line 11
Python Executable:  /usr/bin/python
Python Version:     2.7.5

这是我的错误追踪信息：

/home/david/mysqldb/dev/mysqldb/teams_db/teams_db/urls.py in <module>

        (r'^specimens/', include('specimens.urls')),

▶ Local vars
/usr/local/lib/python2.7/dist-packages/django/conf/urls/__init__.py in include

            urlconf_module = import_module(urlconf_module)

▶ Local vars
/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py in import_module

        __import__(name)

▶ Local vars
/home/david/mysqldb/dev/mysqldb/teams_db/specimens/urls.py in <module>

    from views import new_specimen, list_specimens, info_specimen

▶ Local vars
/home/david/mysqldb/dev/mysqldb/teams_db/specimens/views.py in <module>

    from tests.models import Test

▶ Local vars

在应用 tests 里面，我有一个叫 Test 的类，这个类引发了错误。下面是导致错误的函数（specimens.views）：

from django.shortcuts import render
from django.http import HttpResponse, HttpResponseRedirect,\
                        HttpResponseForbidden, HttpResponseBadRequest,\
                        HttpResponseServerError
from django.core.urlresolvers import reverse
from django.template import RequestContext
from django.shortcuts import render_to_response, get_object_or_404
from forms import SearchForm, SpecimenForm
from projects.models import Project, Serie
from models import Specimen 
from tests.models import Test  ## Test importation!!
import simplejson
import json
from django.core import serializers
from django.forms.models import model_to_dict
import datetime


def new_specimen(request, project_id=None, serie_id=None):
    ...

这是我在 tests.models 里的 Test 类：

from django.db import models
from projects.models import Project
from specimens.models import Specimen
#from operator.models import Operator
from django.core.validators import RegexValidator

class Test(models.Model):

    ref         = models.CharField(max_length=70, unique=True)
    #name       = models.CharField(max_length=70, null=True, blank=True, default='NULL')
    project     = models.ForeignKey(Project)
    specimen    = models.ForeignKey(Specimen)
    #operator   = models.ForeignKey(Operator)
    notes       = models.TextField(max_length=170, blank=True)
    description = models.TextField(max_length=170, blank=True)
    start_date  = models.DateField(null=True, blank=True)
    finish_date = models.DateField(null=True, blank=True)
    status      = models.CharField(max_length=70, blank=True)

你需要更多信息吗？如果有必要，请告诉我。你们觉得问题可能出在哪里？会不会是因为 tests 这个名字是个保留字？？

提前谢谢大家！！

django 错误追踪项目组织模块导入类定义视图函数应用结构保留字

突然出现“没有名为models的模块”

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