接收错误：“TypeError：只能连接列表（而不是”元组“）到列表”

Question

我正在尝试设置一个运行在Python上的软件& Django。该说明说使用下面的命令来生成SQL数据库：

python manage.py migrate

然而，当我这样做，我收到以下错误：

python : Traceback (most recent call last):

At line:1 char:1

+ python manage.py migrate

+ ~~~~~~~~~~~~~~~~~~~~~~~~

+ CategoryInfo : NotSpecified: (Traceback (most recent call last)::String)
[], RemoteException

+ FullyQualifiedErrorId : NativeCommandError

File "manage.py", line 10, in execute_from_command_line(sys.argv) File "C:\Python27\lib\site-packages\django\core\management__init__.py", line 353, in execute_from_command_line utility.execute()

File "C:\Python27\lib\site-packages\django\core\management__init__.py", line 302, in execute settings.INSTALLED_APPS

File "C:\Python27\lib\site-packages\django\conf__init__.py", line 55, in getattr self._setup(name)

File "C:\Python27\lib\site-packages\django\conf__init__.py", line 43, in _setup self._wrapped = Settings(settings_module)

File "C:\Python27\lib\site-packages\django\conf__init__.py", line 99, in init mod = importlib.import_module(self.SETTINGS_MODULE)

File "C:\Python27\lib\importlib__init__.py", line 37, in import_module import(name)

File "F:\directory\settings.py", line 117, in TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + (

TypeError: can only concatenate list (not "tuple") to list

这似乎表明，问题在一行中的“settings.py”文件的116，我有如下：

# Build paths inside the project like this: os.path.join(BASE_DIR, ...) 
import os 
from django.conf import global_settings 

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: 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', 
    'game', 
    'admin_views', 
) 

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 = 'cagweb.urls' 

TEMPLATES = [ 
    { 
     'BACKEND': 'django.template.backends.django.DjangoTemplates', 
     'DIRS': [os.path.join(BASE_DIR, 'game/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 = 'cagweb.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' 
#LANGUAGE_CODE = 'fr' 

LOCALE_PATHS = (
     os.path.join(BASE_DIR, 'locale'), 
) 

TIME_ZONE = 'UTC' 

USE_I18N = True 

USE_L10N = True 

USE_TZ = True 


# Static files (CSS, JavaScript, Images) 
# https://docs.djangoproject.com/en/1.8/howto/static-files/ 

STATICFILES_DIRS = (
     os.path.join(BASE_DIR, "static"), 
) 

STATIC_URL = '/static/' 

TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + (
) 

有人能帮助我了解如何解决这个问题？

我不确定它是否相关，但我正在使用Windows 7，Python 2.7和Powershell来尝试运行此软件。

预先感谢您！如果我留下了任何信息，请让我知道，我会发布它。

Answer 1

()是一个空元组，而[]代表一个空列表。

由于global_settings.TEMPLATE_CONTEXT_PROCESSORS是list类型，你应该只串联的是另一个列表：

TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + [] 

Answer 2

例1

>>> type(()) 
<type 'tuple'> 

例2

>>> [1,2,3] +() 
TypeError: can only concatenate list (not "tuple") to list 

在最后一行你的示例代码，你正在添加()，也就是t他第一个例子1，一个空元组的文字。通过你的错误和例子2，我可以假设global_settings.TEMPLATE_CONTEXT_PROCESSORS是一个列表，你试图“列表+元组”，这是与__add__不兼容，并引发该异常。

尝试改变最后一行：

TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS 

或者，如果由某种未知的原因，你真的需要补充一点......

TEMPLATE_CONTEXT_PROCESSORS = global_settings.TEMPLATE_CONTEXT_PROCESSORS + []