小编Rav*_*avi的帖子

我正在尝试删除字符串中的所有单个字符

输入：“这是一辆大车，它有宽敞的座位”

我的输出应该是：

输出：“这是一辆大车，它有宽敞的座位”

这里我使用了表达式

import re
re.compile('\b(?<=)[a-z](?=)\b')

这与字符串中的第一个单个字符匹配...

任何帮助将不胜感激......提前致谢

我正在尝试在Django中安装django-oauth2-provider.在安装和配置settings.py之后,在迁移期间,我收到的错误如下:

django.core.exceptions.AppRegistryNotReady:尚未加载应用.

settings.py

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'hello_api',
    'rest_framework.authtoken',
    'provider',
    'provider.oauth2',
]

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',
    #'corsheaders.middleware.CorsMiddleware',
]
ROOT_URLCONF = 'hello_api2.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',
            ],
        },
    },
]

错误回溯:

error: File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ravi/PycharmProjects/hello-api2/venv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/home/ravi/PycharmProjects/hello-api2/venv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 341, in execute
    django.setup()
  File "/home/ravi/PycharmProjects/hello-api2/venv/local/lib/python2.7/site-packages/django/__init__.py", …

下面的代码片段以递归方式将嵌套列表和元素展平为新列表,但无法将所有元素附加到列表中.

预期产量:[1,2,4,5,6,7,5,8]

我的输出:[1,2,8]

def foo(l): 
   result = []
   for i in l:
     if type(i)==list:
       foo(i)
     else:
       result.append(i)
return result


input_list = [1,2,[4,5,[6,7],5],8]

print (foo(input_list))