Django用户名密码错误提示

 from django.shortcuts import render
 # Create your views here.

 from django.shortcuts import render
 from django.shortcuts import redirect  #重新定向模块

 def login(request):
      #包含用户提交的所有信息
      #获取用户提交方法
     #print(request.method)
     error_msg = ""
     if request.method == "POST":
         #获取用户通过POST提交过来的数据
         user =request.POST.get('user',None)
         pwd =request.POST.get('pwd',None)
         if user == 'root' and pwd == '':
             #去跳转到
             return  redirect('http://www.baidu.com')
         else:
             #用户密码不匹配
             error_msg = '用户名或密码错误'
         # user = request.POST['user']
         # pwd = request.POST['pwd']
         # print(user,pwd)
     return render(request,'login.html',{'error_msg':error_msg})

views.py

 """
 Django settings for S14Djngo project.

 Generated by 'django-admin startproject' using Django 1.11.6.

 For more information on this file, see
 https://docs.djangoproject.com/en/1.11/topics/settings/

 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/1.11/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/1.11/howto/deployment/checklist/

 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = '^mh@&$v_x+3@+rz$ho$l^t^=tx-=b1a3ylc#nrnuh&mayil-4*'

 # 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',
 ]

 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 = 'S14Djngo.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 = 'S14Djngo.wsgi.application'

 # Database
 # https://docs.djangoproject.com/en/1.11/ref/settings/#databases

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

 # Password validation
 # https://docs.djangoproject.com/en/1.11/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/1.11/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/1.11/howto/static-files/

 STATIC_URL = '/static/'
 STATICFILES_DIRS = (
     os.path.join(BASE_DIR, 'static' ),
                     )

settings.py

 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <title>Title</title>
     <link rel="stylesheet" href="/static/commons.css"/>
     <style>
         label{
             width:80px;
             text-align:right;
             display: inline-block;
         }
     </style>
 </head>
 <body>

     <form action="/login" method="post">
         <p>
             <label for="username">用户名：</label>
             <input id="username" name="user" type='text'/>
         </p>
         <p>
              <label for="password">密码：</label>
              <input id="password" name="pwd" type='password'/>
              <input type="submit" value="提交"/>
             <span style="color:red;">{{ error_msg }}</span>
         </p>
     </form>
     <script src ="/static/jquery.min.js"></script>
 </body>
 </html>

login.html

---

其他文件参考以下步骤

用JetBrains PyCharm 2017.2创建运行Django程序
http://www.cnblogs.com/ujq3/p/7882030.html

创建多个Django业务模块
http://www.cnblogs.com/ujq3/p/7884075.html

Django多业务模块的写法
http://www.cnblogs.com/ujq3/p/7884279.html

Django与HTML业务基本结合--基本的用户名密码提交方法2
http://www.cnblogs.com/ujq3/p/7884615.html

Django静态文件以及模板文件的配置
http://www.cnblogs.com/ujq3/p/7884881.html