Python 类型错误：at/'；模块'；对象不可调用

models.py：

import datetime
from django.db import models
from pygments.lexers import get_all_lexers

LEXERS = [item for item in get_all_lexers() if item[1]]

class Classname(models.Model):
    class_name = models.CharField(max_length=8)
    def __str__(self):
        return self.class_name

class Sectionname(models.Model):
    class_name = models.ForeignKey(Classname)
    section_name = models.CharField(max_length=1, default='A')
    def __str__(self):
        return self.section_name

class Teachername(models.Model):
    classname = models.ForeignKey(Classname, verbose_name='class Name')
    secname = models.ForeignKey(Sectionname, verbose_name='sectionname')
    teachname = models.CharField(max_length=50, verbose_name='teacher Name')
    def __str__(self):
        return self.teachname

class Attendancename(models.Model):
    teacher_name = models.ForeignKey(Teachername)
    date = models.DateField('Date')
    intime = models.TimeField('IN-TIME')
    outtime = models.TimeField('OUT-TIME')

    def hours_conversion(self):
        tdelta = (datetime.datetime.combine(datetime.date.today(),self.outtime) - datetime.datetime.combine(datetime.date.today(),self.intime))
    hours, minutes = tdelta.seconds//3600, (tdelta.seconds//60)%60
        return '{0}hrs {1}mins'.format(hours, minutes)

    def __str__(self):
         return "%s" %self.teacher_name

views.py：

from django.contrib.auth.models import User
from .models import Classname, Sectionname, Teachername, Attendancename
from rest_framework import generics, reverse
from rest_framework.response import Response
from rest_framework.decorators import api_view
from .serializers import ClassSerializer, SectionSerializer, TeacherSerializer, AttendanceSerializer, UserSerializer
from rest_framework.permissions import IsAuthenticatedOrReadOnly



#serializing code starts from here!
@api_view(('GET',))    """when I add this view it raises above exception"""
def api_root(request, format=None):
    return Response({
    'users': reverse('user-list', request=request, format=format),
    'class':reverse('class', request=request, format=format),
    'section':reverse('student:section', request=request, format=format),
    'teacher':reverse('student:teacher', request=request, format=format),
    'attendance':reverse('student:attend', request=request, format=format)
    })

class UserList(generics.ListAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer


class UserDetail(generics.RetrieveAPIView):
    queryset = User.objects.all()
    serializer_class = UserSerializer

class ClassList(generics.ListCreateAPIView):
    queryset = Classname.objects.all()
    serializer_class = ClassSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class ClassDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Classname.objects.all()
    serializer_class = ClassSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class SectionList(generics.ListCreateAPIView):
    queryset = Sectionname.objects.all()
    serializer_class = SectionSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class SectionDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Sectionname.objects.all()
    serializer_class = SectionSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class TeacherList(generics.ListCreateAPIView):
    queryset = Teachername.objects.all()
    serializer_class = TeacherSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class TeacherDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Teachername.objects.all()
    serializer_class = TeacherSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class AttendanceList(generics.ListCreateAPIView):
    queryset = Attendancename.objects.all()
    serializer_class = AttendanceSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

class AttendanceDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Attendancename.objects.all()
    serializer_class = AttendanceSerializer
    permission_classes = (IsAuthenticatedOrReadOnly,)

URL.py：

from django.conf.urls import url, patterns
from . import views

urlpatterns = [
    #DRF urls start from here...
    url(r'^', views.api_root),
    url(r'^users/$', views.UserList.as_view()),
    url(r'^users/(?P<pk>[0-9]+)/$', views.UserDetail.as_view()),
    url(r'^class/$', views.ClassList.as_view(), name='class'),
    url(r'^class/(?P<pk>[0-9]+)/$', views.ClassDetail.as_view(), name='classdet'),
    url(r'^section/$', views.SectionList.as_view(), name='section'),
    url(r'^section/(?P<pk>[0-9]+)/$', views.SectionDetail.as_view(), name='sectiondet'),
    url(r'^teach/$', views.TeacherList.as_view(), name='teacher'),
    url(r'^teach/(?P<pk>[0-9]+)/$', views.TeacherDetail.as_view(), name='teacherdet'),
    url(r'^attend/$', views.AttendanceList.as_view(), name='attend'),
    url(r'^attend/(?P<pk>[0-9]+)/$', views.AttendanceDetail.as_view(), name='attendet'),
 ]

我正在遵循关于DRF的教程，并在我自己的演示应用程序上尝试它，一切正常，除了尝试在myviews.py文件中添加

'root\u api'

视图时，它立即引发上述异常

我想为我的所有视图创建一个单一的入口点，如教程中所示

我不知道为什么它会显示这种行为，因为我在URL中也使用了名称空间。我在哪里做错了吗

求你了！帮我修一下

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谢谢！提前….

您在导入中遗漏了一些内容。不是

from rest_framework import reverse

但是

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请编辑您的帖子并添加完整的错误回溯！谢谢。这是我的全部回溯。。。。

from rest_framework import reverse

from rest_framework.reverse import reverse