{% for %} 允许我们在一个序列上迭代。与Python的for 语句的情形类似，循环语法是 for X in Y ，Y是要迭代的序列 而X是在每一个特定的循环中使用的变量名称。每一次循环中，模板系统会渲染在{% for %} and {% endfor %} 中的所有内 容。 例如，给定一个运动员列表athlete_list 变量，我们可以使用下面的代码来显示这个列表：
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<ul> {% for athlete in athlete_list %} <li>{{ athlete.name }}</li> {% endfor %} </ul>
给标签增加一个reversed 使得该列表被反向迭代：
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{% for athlete in athlete_list reversed %} ... {% endfor %}
可以嵌套使用 {% for %} 标签：
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{% for country in countries %} <h1>{{ country.name }}</h1> <ul>
{% for city in country.city_list %} <li>{{ city }}</li> {% endfor %} </ul> {% endfor %}
{% for country in countries %} <table> {% for city in country.city_list %} <tr> <td>Country #{{ forloop.parentloop.counter }}</td> <td>City #{{ forloop.counter }}</td> <td>{{ city }}</td> </tr> {% endfor %} </table> {% endfor %}
DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'. 'NAME': 'walkerfree', # Or path to database file if using sqlite3. 'USER': 'root', # Not used with sqlite3. 'PASSWORD': 'zhangda890126;;', # Not used with sqlite3. 'HOST': 'localhost', # Set to empty string for localhost. Not used with sqlite3. 'PORT': '3306', # Set to empty string for default. Not used with sqlite3. } }
# Local time zone for this installation. Choices can be found here: # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name # although not all choices may be available on all operating systems. # In a Windows environment this must be set to your system time zone. TIME_ZONE = 'Asia/Chongqing'
# Language code for this installation. All choices can be found here: # http://www.i18nguy.com/unicode/language-identifiers.html LANGUAGE_CODE = 'en-us'
SITE_ID = 1
# If you set this to False, Django will make some optimizations so as not # to load the internationalization machinery. USE_I18N = True
# If you set this to False, Django will not format dates, numbers and # calendars according to the current locale. USE_L10N = True
# If you set this to False, Django will not use timezone-aware datetimes. USE_TZ = True
# Absolute filesystem path to the directory that will hold user-uploaded files. # Example: "/home/media/media.lawrence.com/media/" MEDIA_ROOT = '/home/davidzhang/walkerfree/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/'
# Absolute path to the directory static files should be collected to. # Don't put anything in this directory yourself; store your static files # in apps' "static/" subdirectories and in STATICFILES_DIRS. # Example: "/home/media/media.lawrence.com/static/" STATIC_ROOT ='/home/davidzhang/walkerfree/static/'
# Additional locations of static files STATICFILES_DIRS = ( # Put strings here, like "/home/html/static" or "C:/www/django/static". # Always use forward slashes, even on Windows. # Don't forget to use absolute paths, not relative paths. )
# List of finder classes that know how to find static files in # various locations. STATICFILES_FINDERS = ( 'django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder', # 'django.contrib.staticfiles.finders.DefaultStorageFinder', )
# Make this unique, and don't share it with anybody. SECRET_KEY = '0h&*b8sw)*fu_oy+jj_%bun3*&3v&*!5#79un!do71eq4su86x'
# List of callables that know how to import templates from various sources. TEMPLATE_LOADERS = ( 'django.template.loaders.filesystem.Loader', 'django.template.loaders.app_directories.Loader', # 'django.template.loaders.eggs.Loader', )
MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', # Uncomment the next line for simple clickjacking protection: # 'django.middleware.clickjacking.XFrameOptionsMiddleware', )
ROOT_URLCONF = 'walkerfree.urls'
# Python dotted path to the WSGI application used by Django's runserver. WSGI_APPLICATION = 'walkerfree.wsgi.application'
TEMPLATE_DIRS = ( # Put strings here, like "/home/html/django_templates" or "C:/www/django/templates". # Always use forward slashes, even on Windows. # Don't forget to use absolute paths, not relative paths. "/home/davidzhang/walkerfree/templates" )
INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.staticfiles', # Uncomment the next line to enable the admin: # 'django.contrib.admin', # Uncomment the next line to enable admin documentation: # 'django.contrib.admindocs', 'walkerfree', )
# A sample logging configuration. The only tangible logging # performed by this configuration is to send an email to # the site admins on every HTTP 500 error when DEBUG=False. # See http://docs.djangoproject.com/en/dev/topics/logging for # more details on how to customize your logging configuration. LOGGING = { 'version': 1, 'disable_existing_loggers': False, 'filters': { 'require_debug_false': { '()': 'django.utils.log.RequireDebugFalse' } }, 'handlers': { 'mail_admins': { 'level': 'ERROR', 'filters': ['require_debug_false'], 'class': 'django.utils.log.AdminEmailHandler' } }, 'loggers': { 'django.request': { 'handlers': ['mail_admins'], 'level': 'ERROR', 'propagate': True, }, } }
NSString *string = @" spaces in front and at the end "; NSString *trimmedString = [string stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]]; NSLog(trimmedString);