juqery，ajax在for循环中，为什么ajax中的success函数只显示循环的最后一个数值_course

图中length长度是3， foodid是{“0”：1，“1”：2，“2”：3}， amount是{“0”：3，“1”：1，“2”：2} 为什么success函数中，famount的值全是2（即am

django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists") 迁移文件建立数据表的时候一直报错_course

django.db.utils.InternalError: (1050, "Table 'django_content_type' already exists") 在网上看到很多的方法，大概都是 先删除 所有的迁移文件， 再删除 数据库中对应的 Django_migrations 表里面的所有数据 之后再进行创建迁移文件然后再执行创建数据表的操作，但是报 没有应用啥啥啥的错误。。。 接着执行： python manage.py migrate booktest --fake 结果再执行 ： python manage.py migrate 还是报 1050 的错误。。。。。。。。 下面附上详细报错信息，求网友大哥们解答~~！！ (django_py3) huangdonglin@huangdonglin-virtual-machine:~/django_show/test2$ python manage.py migrate Operations to perform: Synchronize unmigrated apps: messages, staticfiles Apply all migrations: admin, booktest, sessions, auth, contenttypes Synchronizing apps without migrations: Creating tables... Running deferred SQL... Installing custom SQL... Running migrations: Rendering model states... DONE Applying contenttypes.0001_initial...Traceback (most recent call last): File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/utils.py", line 62, in execute return self.cursor.execute(sql) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 124, in execute return self.cursor.execute(query, args) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute result = self._query(query) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query conn.query(q) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 732, in _read_query_result result.read() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 1075, in read first_packet = self.connection._read_packet() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 684, in _read_packet packet.check_error() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/protocol.py", line 220, in check_error err.raise_mysql_exception(self._data) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/err.py", line 109, in raise_mysql_exception raise errorclass(errno, errval) pymysql.err.InternalError: (1050, "Table 'django_content_type' already exists") The above exception was the direct cause of the following exception: Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line utility.execute() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/core/management/__init__.py", line 330, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/core/management/base.py", line 390, in run_from_argv self.execute(*args, **cmd_options) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/core/management/base.py", line 441, in execute output = self.handle(*args, **options) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 221, in handle executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/migrations/executor.py", line 110, in migrate self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in apply_migration state = migration.apply(state, schema_editor) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/migrations/migration.py", line 115, in apply operation.database_forwards(self.app_label, schema_editor, old_state, project_state) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/migrations/operations/models.py", line 59, in database_forwards schema_editor.create_model(model) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 286, in create_model self.execute(sql, params or None) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 111, in execute cursor.execute(sql, params) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/utils.py", line 79, in execute return super(CursorDebugWrapper, self).execute(sql, params) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/utils.py", line 97, in __exit__ six.reraise(dj_exc_type, dj_exc_value, traceback) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/utils/six.py", line 658, in reraise raise value.with_traceback(tb) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/utils.py", line 62, in execute return self.cursor.execute(sql) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 124, in execute return self.cursor.execute(query, args) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/cursors.py", line 170, in execute result = self._query(query) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/cursors.py", line 328, in _query conn.query(q) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 517, in query self._affected_rows = self._read_query_result(unbuffered=unbuffered) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 732, in _read_query_result result.read() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 1075, in read first_packet = self.connection._read_packet() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/connections.py", line 684, in _read_packet packet.check_error() File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/protocol.py", line 220, in check_error err.raise_mysql_exception(self._data) File "/home/huangdonglin/.virtualenvs/django_py3/lib/python3.6/site-packages/pymysql/err.py", line 109, in raise_mysql_exception raise errorclass(errno, errval)

Django2.2 配置haystack问题_course

我已经安装了django-haystack，在settings中添加了“haystack”app配置 settings 配置 INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'tinymce', 'user', 'goods', 'cart', 'order', 'haystack' ] 但在运行时报如图所示错误  实在解决不了了 求大神帮忙

已配置django-cors-headers，Django跨域访问json还是不成功_course

报错信息：   Setting.py配置和Html调用代码： ``` ALLOWED_HOSTS = ['*'] # Application definition INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'corsheaders', 'visualization', 'management' ] MIDDLEWARE = [ 'django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'corsheaders.middleware.CorsMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware', ] CORS_ALLOW_CREDENTIALS = True CORS_ORIGIN_ALLOW_ALL = True CORS_ORIGIN_WHITELIST = ( '*' ) ``` ``` $.ajax({ url:'http://api.k780.com/?app=weather.pm25&weaid=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json', type:'GET', success:function(data){ console.log(data); } }); ```

在Linux下 安装Django后，import django不成功_course

``` cd Django-1.7.1 python setup.py install python >>> import django Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named django ``` ``` cd /usr/local/python2.7/lib/python2.7/site-packages/ ls Django-1.7.1-py2.7.egg easy-install.pth README setuptools-7.0-py2.7.egg setuptools.pth ``` ython是自己安装的2.7.5版本的，老的Python没有卸载，安装了Django以后，导入Django失败，求解。。。

django连接MySQL报错django.db.utils.OperationalError: (2006, <NULL>)？_course

最近想学django，于是照着Django官方文档一步步学，没想到刚到连接数据库，就卡了。 在pycharm上通过django连接MySQL报如图所示错误 网上搜索，试了各种方法，包括改hosts文件和HOST改成127.0.0.1，都不成功。把下面这几行代码注释掉，换成原来的sqlite，就可以成功运行，实在不知道什么原因，请各位大佬帮忙看下怎么解决。 环境：Django2.2.1、MySql8.0 下面是我的setting.py文件。一开始pycharm也连不上Mysql，我改了他的时区，Asia/Shanghai，就可以了，但是Django怎么也连不上 ``` """ Django settings for webProject project. Generated by 'django-admin startproject' using Django 2.2.1. For more information on this file, see https://docs.djangoproject.com/en/2.2/topics/settings/ For the full list of settings and their values, see https://docs.djangoproject.com/en/2.2/ref/settings/ """ import os # Build paths inside the project like this: os.path.join(BASE_DIR, ...) BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) # Quick-start development settings - unsuitable for production # See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/ # SECURITY WARNING: keep the secret key used in production secret! SECRET_KEY = 'uri0z)r@kn3p)l%6(9if)1$74kv9ag$p@zadp_p$ph_x0(v9h=' # SECURITY WARNING: don't run with debug turned on in production! 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', 'polls', ] MIDDLEWARE = [ 'django.middleware.security.SecurityMiddleware', '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 = 'webProject.urls' TEMPLATES = [ { 'BACKEND': 'django.template.backends.django.DjangoTemplates', 'DIRS': [os.path.join(BASE_DIR, 'templates')] , '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', ], }, }, ] WSGI_APPLICATION = 'webProject.wsgi.application' # Database # https://docs.djangoproject.com/en/2.2/ref/settings/#databases # DATABASES = { # 'default': { # 'ENGINE': 'django.db.backends.sqlite3', # 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), # } # } DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'webcrawler', 'USER': 'root', 'PASSWORD': '111111', 'HOST': 'localhost', 'PORT': '3306', } } # Password validation # https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators AUTH_PASSWORD_VALIDATORS = [ { 'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator', }, { 'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator', }, { 'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator', }, { 'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator', }, ] # Internationalization # https://docs.djangoproject.com/en/2.2/topics/i18n/ LANGUAGE_CODE = 'en-us' TIME_ZONE = 'Asia/Shanghai' USE_I18N = True USE_L10N = True USE_TZ = True # Static files (CSS, JavaScript, Images) # https://docs.djangoproject.com/en/2.2/howto/static-files/ STATIC_URL = '/static/' ```

问个有关python+django+heroku的问题_course

``` Traceback (most recent call last): File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) psycopg2.errors.UndefinedTable: relation "auth_user" does not exist LINE 1: ...user"."is_active", "auth_user"."date_joined" FROM "auth_user... The above exception was the direct cause of the following exception: Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 351, in execute_from_command_line utility.execute() File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 325, in execute django.setup() File "/app/.heroku/python/lib/python3.6/site-packages/django/__init__.py", line 18, in setup apps.populate(settings.INSTALLED_APPS) File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/registry.py", line 108, in populate app_config.import_models(all_models) File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/config.py", line 198, in import_models self.models_module = import_module(models_module_name) File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 978, in _gcd_import File "<frozen importlib._bootstrap>", line 961, in _find_and_load File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 655, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 678, in exec_module File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed File "/app/learning_logs/models.py", line 7, in <module> class Topic(models.Model): File "/app/learning_logs/models.py", line 8, in Topic choices=Help().choices() File "/app/learning_logs/help.py", line 9, in choices for user in users: File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 162, in __iter__ self._fetch_all() File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 965, in _fetch_all self._result_cache = list(self.iterator()) File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/query.py", line 238, in iterator results = compiler.execute_sql() File "/app/.heroku/python/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 840, in execute_sql cursor.execute(sql, params) File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) File "/app/.heroku/python/lib/python3.6/site-packages/django/db/utils.py", line 97, in __exit__ six.reraise(dj_exc_type, dj_exc_value, traceback) File "/app/.heroku/python/lib/python3.6/site-packages/django/utils/six.py", line 658, in reraise raise value.with_traceback(tb) File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) django.db.utils.ProgrammingError: relation "auth_user" does not exist LINE 1: ...user"."is_active", "auth_user"."date_joined" FROM "auth_user... ``` 在heroku bash操作makemigrations,migrate中出现的错误 在本地用这些没问题 settings.py ``` """ Django settings for learning_log project. Generated by 'django-admin startproject' using Django 1.8.5. For more information on this file, see https://docs.djangoproject.com/en/1.8/topics/settings/ For the full list of settings and their values, see https://docs.djangoproject.com/en/1.8/ref/settings/ """ # Build paths inside the project like this: os.path.join(BASE_DIR, ...) import os import django_heroku BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) # Quick-start development settings - unsuitable for production # See https://docs.djangoproject.com/en/1.8/howto/deployment/checklist/ # SECURITY WARNING: keep the secret key used in production secret! SECRET_KEY = 'o47!#$sbu_&=)pnbk63ra!hjbx@+pc=2j42cf(&mx82&hs&ph_' # SECURITY WARNING: don't run with debug turned on in production! DEBUG = True ALLOWED_HOSTS = [] # Application definition INSTALLED_APPS = ( 'whitenoise.runserver_nostatic', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', #my app 'learning_logs', 'users', #other app 'bootstrap3', ) MIDDLEWARE = [ 'django.middleware.clickjacking.XFrameOptionsMiddleware', 'whitenoise.middleware.WhiteNoiseMiddleware', ] MIDDLEWARE_CLASSES = ( 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware', 'django.middleware.security.SecurityMiddleware', ) ROOT_URLCONF = 'learning_log.urls' TEMPLATES = [ { 'BACKEND': 'django.template.backends.django.DjangoTemplates', 'DIRS': [], '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', ], }, }, ] WSGI_APPLICATION = 'learning_log.wsgi.application' # Database # https://docs.djangoproject.com/en/1.8/ref/settings/#databases DATABASES = { 'default': { 'ENGINE': 'django.db.backends.sqlite3', 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), } } # Internationalization # https://docs.djangoproject.com/en/1.8/topics/i18n/ LANGUAGE_CODE = 'en-us' TIME_ZONE = 'UTC' USE_I18N = True USE_L10N = True USE_TZ = True LOGIN_URL = '/users/login/' # Static files (CSS, JavaScript, Images) # https://docs.djangoproject.com/en/1.8/howto/static-files/ STATIC_URL = '/static/' MEDIA_URL = '/media/' MEDIA_ROOT = os.path.join(BASE_DIR, 'media') STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles') if os.getenv('DATABASE_URL') is not None: import dj_database_url DATABASES['default'] = dj_database_url.config() SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https') ALLOWED_HOSTS = ['stark-anchorage-08076.herokuapp.com'] DEBUG = False BASE_DIR = os.path.dirname(os.path.abspath(__file__)) STATICFILES_DIRS = ( os.path.join(BASE_DIR, 'static'), ) django_heroku.settings(locals()) ``` views.py ``` from django.shortcuts import render from .models import Topic, Entry, Root, Suf_Pre_fix from django.http import HttpResponseRedirect, Http404 from django.core.urlresolvers import reverse from .forms import TopicForm, EntryForm, RootForm from django.contrib.auth.decorators import login_required from .help import Help from django.contrib.auth.models import User # Create your views here. def index(request): return render(request, 'learning_logs/index.html') @login_required def topics(request): topics = Topic.objects.order_by('date_added') context = {'topics': topics} return render(request, 'learning_logs/topics.html', context) @login_required def topic(request, topic_id): topic = Topic.objects.get(id=topic_id) entries = topic.entry_set.order_by('-date_added') context = {'topic': topic,'entries': entries} return render(request, 'learning_logs/topic.html', context) @login_required def new_topic(request): if request.method != 'POST': form = TopicForm() else: form = TopicForm(request.POST) if form.is_valid(): new_topic = form.save(commit=False) new_topic.owner = request.user new_topic.edit_able = request.POST.getlist("edit_able") new_topic.save() return HttpResponseRedirect(reverse('learning_logs:topics')) context = {'form': form, 'users':Help().users()} return render(request, 'learning_logs/new_topic.html', context) @login_required def new_entry(request, topic_id): topic = Topic.objects.get(id=topic_id) if request.method != 'POST': form = EntryForm() else: form = EntryForm(data=request.POST) if form.is_valid(): new_entry = form.save(commit=False) new_entry.topic = topic new_entry.edit_able = request.POST.getlist("edit_able") new_entry.save() return HttpResponseRedirect(reverse('learning_logs:topic',args=[topic_id])) context = {'topic':topic, 'form': form, 'users':Help().users()} return render(request, 'learning_logs/new_entry.html', context) @login_required def edit_entry(request, entry_id): entry = Entry.objects.get(id=entry_id) topic = entry.topic if not Help().check_user(request.user,entry.edit_able) or not Help().check_user(request.user,topic.edit_able): raise Http404 if request.method != 'POST': form = EntryForm(instance=entry) else: form = EntryForm(instance=entry, data=request.POST) if form.is_valid(): edit_entry = form.save(commit=False) edit_entry.edit_able = request.POST.getlist("edit_able") edit_entry.save() return HttpResponseRedirect(reverse('learning_logs:topic',args=[topic.id])) context = {'entry': entry, 'topic': topic, 'form': form ,'users':Help().users()} return render(request, 'learning_logs/edit_entry.html', context) @login_required def roots(request): roots = Root.objects.order_by('date_added') context = {'roots': roots} return render(request, 'learning_logs/roots.html', context) def root(request, root_id): root = Root.objects.get(id=root_id) things = root.things.order_by('-date_added') context = {'root':root, 'things':things} return render(request, 'learning_logs/root.html', context) ``` help.py ``` from django.contrib.auth.models import User class Help(): def __init__(self): pass def choices(self): users=User.objects.all() choices=[] a=1 for user in users: choices.append((a,str(user))) a+=1 return choices def check_user(self,user,users): try: str(users).index(str(user)) except: return False else: return True def users(self): users=[] for user in User.objects.all(): users.append(str(user)) return users def test_list(self,list1): for item in list1: print(type(item)) def test_word(self,item): print(item,type(item)) ```

没有安装django却能够部署django网站_course

+ 情况：原来的腾讯云服务器到期被**回收**了，到期之前做了个镜像，然后把镜像安装到了另一台服务器上，原来用iis挂在过期服务器上的网站，只要换了公网地址就能够正常访问，问题来了！！！ + 今天我想改动一下后台代码，竟被提示未安装Django，然后我赶快看了下pip-list，果然没有，但是我的网站一直在运行啊，没有问题啊，为啥出现这个错误？ + 期间我为了安装scrapy安装了anaconda，是不是这货给我弄没的？求教，吓得我在弄清楚情况之前都不敢操作了。

Django在通过admin登录django自带后台的时候遇到了302问题，应该怎么解决？_course

最近学Django，跟着书本和教程做了几个网站当练习，但在创建好superuser， 用http://127.0.0.1:8000/admin 登录django自带的后台的时候出现了302提示  然后django就自动断开了。。。。。。 因为这个练习是刚开始做，想看下代码有没问题就还只写了model.py和admin.py，admin.py只是对模型注册了下，没有写任何其他的代码，所以不清楚是哪里出了问题。 谷歌了一下，虽然也有碰到类似问题的朋友但回答基本都不顶用，所以来论坛求救，有哪位大神知道什么原因吗？谢谢！！ PS：之前做的几个练习都好的，但最近因为出现这个问题就重新运行了下，结果也出现302的提示。。。。。。。

pycharm Django setting.py文件配置问题_course

INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', # 'app1.apps.App1Config', 'app1', ] 注：最后一行本没有，我自己加上的。本来有加注释的这行（让我注释掉了）。 以上代码，我看别的教程是没有我加注释这行的，而我自己用pycharm建的Django项目 有加注释的这行。所有教程都说让我加上最后一行，而没有提注释这行，新手表示注释这行很奇怪啊，请问大神这行是干什么的？？

Django应用内存限制问题_course

我在用Django搭建的项目中遇到一个问题，就是在后端代码中涉及对内存消耗极大的计算，可能会达到几个G，然后应用在运行的时候，运行到这个部分就崩溃了，我的计算机有32G内存，应该不是机器内存耗尽，那么是Django对可用内存有限制吗？如果有的话如何放开限制呢，如果不是这个问题，那应该怎么解决呢，各位大大有没有好的解决方案，拜谢！

Django-cas 单点登录求助大神_course

报错信息： [Errno socket error] [Errno 1] _ssl.c:504: error:14077438:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert internal error Django Setting文件里面已经安装配置配置了，附上setting部分代码： INSTALLED_APPS = ( 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', #'django_cas', ) 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', 'django_cas.middleware.CASMiddleware', 'django.middleware.doc.XViewMiddleware', ) AUTHENTICATION_BACKENDS = ( 'django.contrib.auth.backends.ModelBackend', 'django_cas.backends.CASBackend', ) CAS_SERVER_URL=‘xxx.xxx.xxx/login’

发送JSON到Django模板_course

<div class="post-text" itemprop="text"> <p>I have a very basic Django view that, once it receives a request, should send a response to the page that the user is visiting, so that i can display a message on that page, without having to refresh the page.</p> <p>Here is my view:</p> <pre><code>def Action(request): response = '' if request.method == 'POST': if request.POST.get('ajaxform', False) == 'submit': data = request.POST.get('formdata', False) mymodel = Userdata() mymodel.save() response = 'Submitted!' return HttpResponse(json.dumps(response), content_type='application/json') </code></pre> <p>Basically, when a POST request is received, this view should send a JSON response to the template with the message <code>Submitted</code>. </p> <p>This view works, when i'm browsing my template, on my Dev tools i can see the JSON response <code>Submitted</code> being received by the page, but i don't understand how can i show it using Jquery.</p> <p>Can someone point me out on how could i create a Jquery function that is triggered only when a Json response is received by a Django view?</p> <p>Basically, in this case, when the Django view fires the response <code>Submitted</code>, my Jquery function should receive that message and do some stuff with it.</p> <p>I tried this:</p> <pre><code>$.ajax({ url: "/mytemplate/Action", type: 'get', dataType: 'json', success: function (data) { console.log(data) } }); </code></pre> <p>The problem with this function, though, is that nothing is being printed in my console, although i can see the response on my Network tab.</p> </div>

django、subprocess多进程 报错django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet._course

在django程序中，使用了subprocess多进程，代码如下。 ``` #开始启动进程去处理业务 使用跨平台的多进程库subprocess PYTHON = sys.executable shell_cmd = '"%s" -m supportchannel.wechat_servers.wechatProcess %s' % (PYTHON, userKey) #let servers be a package cmd = shlex.split(shell_cmd) try: child = subprocess.Popen(args=cmd, shell=False) ``` 程序在运行的时候报错django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet. 感觉是subprocess的多进程无法和djangoapp通讯，求解决方法。

django get请求会获取旧的数据，检测get请求未执行方法 但经过了中间件，不知道为什么_course

``` 'django.middleware.cache.UpdateCacheMiddleware', # This must be first on the list 'django.middleware.security.SecurityMiddleware', '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', 'MiddleWare.auth.authenticationMiddleWare', 'django.middleware.cache.FetchFromCacheMiddleware', # This must be last ``` 以上是中间件

启动Django项目报错could't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable?_course

**电脑A建立虚拟环境下的Django项目复制到电脑B中**， **报错 **could't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment? 我**已经进入了虚拟环境**中manage.py的目录下才运行python manage.py runserver， 也**已经在虚拟环境中装好了Django**，文件目录如下图，求助大神们，怎么才能在**电脑B**上成功运行Django项目？！感谢！

python3 django models 调用出错_course

图片说明](https://img-ask.csdn.net/upload/201708/08/1502159219_209781.png)[参考连接](http://www.runoob.com/django/django-model.html "demo") # models.py from django.db import models class Test(models.Model): name = models.CharField(max_length=20) #testdb.py from django.http import HttpResponse from TestModel.models import Test # 数据库操作 def testdb(request): test1 = Test(name='runoob') test1.save() return HttpResponse("<p>数据添加成功！</p>") 报错：ModuleNotFoundError: No module named 'Test'

django中CSS代码不起作用_course

在django项目中,我把css文件放到static/css/style.css中 但是没有起作用...但是打开谷歌的开发者工具,在sources中确实能看到css代码加载了 显示如下:  django的settings文件也设置了:  网页中控制台显示如下: 

在django，有像php这样的控制器吗？_course

<div class="post-text" itemprop="text"> <p>This is a follow up question to <a href="https://stackoverflow.com/questions/19989549/how-can-i-run-a-django-management-command-by-cron-job">How can I run a django management command by cron job</a>. I'm trying to get a better understanding of the way to organize code, having come from php MVC frameworks.</p> <p>In php ( lets say codeigniter ) , A URL will activate a specific controller. </p> <p>The first answer to the above question states:</p> <pre><code>One option is, you can create a URL endpoint, and the corresponding view would call the management command. </code></pre> <p>Without much python/django knowledge, it just seems surprising to me that so you have to get a view involved in running an abritrary app or a controller-like piece of code where no output is needed. Is this really the only way to do this in Django? If so why is it structured this way?</p> </div>

Django文件上传Ajax_course

<div class="post-text" itemprop="text"> <p>I am trying to upload a file in Django using Ajax. I have tried different approaches but I've get same results. The file cannot be read in the view.</p> <p>Here is my codes:</p> <pre><code>#JS $("#upload-file").click(function() { var data = new FormData($('#fileForm').get(0)); var csrftoken = getCookie('csrftoken'); $.ajax({ type: "POST", headers: {'X-CSRFToken': csrftoken}, url: "/countwords/", data: data, cache: false, processData: false, contentType: false, success: function(json) { var ss = json.len; alert(ss);}, error: function() { alert('error');} }); }); </code></pre> <p>finally here is my view codes:</p> <pre><code>if request.method == 'POST': print request.FILES.keys() print request.FILES print request.POST.keys() </code></pre> <p>But I get following output when the code is run:</p> <pre><code>[] MultiValueDict: {} [] </code></pre> </div>

django admin 如何分页加载数据？_course

 ps:django admin 中使用list_display展示列，使用了自带的分页功能（settings中设置：'LIST_PER_PAGE': 20,），但是自带分页机制是全部加载数据后再进行分页的，这样数据大了之后访问速度就非常慢了，请问如何在list_display展示前分页加载数据，另django admin 是不用自己编写view的，期待同道中人指点一二