在 django 框架 python 中出现错误 404

Question

我是 django 的新手，我尝试通过使用 django 框架上传图像并在网页上显示来构建 webapp。 在以某种方式解决了许多来自 urls.py 的错误之后，服务器终于运行了，但最后又在网页上找不到 Page not found (404) 错误。 我在下面上传所有必要的代码。

myproject/myproject/settings.py

import os
BASE_DIR = os.path.dirname(os.path.dirname(__file__))
PROJECT_ROOT = os.path.realpath(os.path.dirname(__file__))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.6/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '2z$tk#wj&&pc(0ps4!7w_o_lm4h!3flwy+8%%s3k5pqars=ta&'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

TEMPLATE_DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp',   )
MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
)

ROOT_URLCONF = 'myproject.urls'

WSGI_APPLICATION = 'myproject.wsgi.application'

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3', # Add   'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'.
       'NAME': os.path.join(PROJECT_ROOT,   'database/database.sqlite3'),                          # Or path to   database file if using sqlite3.
       'USER': '',                      # Not used with sqlite3.
       'PASSWORD': '',                  # Not used with sqlite3.
       'HOST': '',                      # Set to empty string for     localhost. Not used with sqlite3.
       'PORT': '',                      # Set to empty string for       default. Not used with sqlite3.
    }
}

'''
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}
'''

# Internationalization
# https://docs.djangoproject.com/en/1.6/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.6/howto/static-files/

STATIC_URL = '/static/'


# Absolute filesystem path to the directory that will hold user-uploaded files.
# Example: "/home2/media/media.lawrence.com/media/"
MEDIA_ROOT = os.path.join(PROJECT_ROOT, 'media')

# URL that handles the media served from MEDIA_ROOT. Make sure to use a
#trailing slash.
# Examples: "http://media.lawrence.com/media/",    "http://example.com/media/"
MEDIA_URL = '/media/'

myproject/myapp/urls.py
from django.conf.urls import url
from . import views

urlpatterns = [

    url(r'^$', views.list, name='list'),
    url(r'^$', views.index, name='index'),
    url(r'^list/$', views.list, name='list'),
]

myproject/myapp/views.py

# -*- coding: utf-8 -*-
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse

from myapp.models import Document
from myapp.forms import DocumentForm

def list(request):
    # Handle file upload
    if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
        if form.is_valid():
        newdoc = Document(docfile = request.FILES['docfile'])
        newdoc.save()

        # Redirect to the document list after POST
        return HttpResponseRedirect(reverse('list'))
    else:
        form = DocumentForm() # A empty, unbound form

        #Load documents for the list page
        documents = Document.objects.all()

        #Render list page with the documents and the form
        return render_to_response(
       'myapp/list.html',
       {'documents': documents, 'form': form},
       context_instance=RequestContext(request)
       )

 def index(request):
     return render_to_response('myapp/index.html')

myproject/myproject/urls.py

from django.conf.urls import include, url
from django.conf import settings
from django.conf.urls.static import static
from django.views.generic import RedirectView
from django.contrib import admin
# admin.autodiscover()

urlpatterns = [
        url(r'^myapp/', include('myapp.urls')),
        url(r'^admin/', include(admin.site.urls)),

]
urlpatterns+= static(settings.MEDIA_URL,     document_root=settings.MEDIA_ROOT)

myproject/myapp/urls.py

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

urlpatterns = [

    # url(r'^$', views.list, name='list'),
    url(r'^$', views.index, name='index'),
    url(r'^list/$', views.list, name='list'),
]

terminal screenshot

updated error

Answer 1

您的网址当前设置用于：

127.0.0.1:8000/myapp/
127.0.0.1:8000/myapp/list/
127.0.0.1:8000/admin

127.0.0.1:8000/ 没有设置 URL - 基于this SO answer，您可以像这样创建索引页面：

from django.views.generic.base import TemplateView

    urlpatterns = [
            url(r'^myapp/', include('myapp.urls')),
            url(r'^admin/', include(admin.site.urls)),
            url(r'^$', TemplateView.as_view(template_name='myapp/index.html'),
            name='home'),
    ]

或者只是将您的浏览器定向到首先列出的 URL 之一。

更新：您似乎还缺少模板设置，如果当前不存在，请将以下内容添加到您的 settings.py。

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

Django URL 可能有点难以掌握 - 你可能想read the documentation on them