小编use*_*364的帖子

我尝试django-admin.py makemessages -l zh_CN但有错误:

CommandError: Can't find msguniq. Make sure you have GNU gettext tools 0.15 or newer installed.

在我使用brew install gettext之后,它仍然出错了.
我需要做点什么吗？这是我的终端截图
请指导我谢谢.

如何获取docker container root的密码？

[root@localhost train02]# docker exec -it jenkins /bin/bash
[jenkins@89d5aa94e6ec /]ls /root
ls:cannot open directory /root: Permission denied

我pip freeze > requirements.txt用来收集我安装的所有软件包。但是开发了很多天，有些包现在没用了。如何找到这些未使用的包并删除它们，以使我的项目更加清晰？

如何确保datetime.date.today() 转换为UTC时间？

到目前为止这是我的代码:

#today : 2014-12-21
today = datetime.date.today()

#1900-01-01 16:00:00+00:00
timeformat = datetime.datetime.strptime('16:00', '%H:%M').replace(tzinfo=pytz.utc)

#combine today and timeformat  2014-12-21 16:00:00
now = datetime.datetime.combine(u, timeformat.time())
str_now =  now.strftime("%Y-%m-%d %H:%M:%S")

我使用过滤器来检查登录用户的URL模式.

但是我需要过滤许多URL模式.

{ "/table/*", "/user/*", "/contact/*", "/run/*", "/conf/*", ..., ..., ...}

它变得不可维护.排除以下内容会更简单:

{ "/", "/login", "/logout", "/register" }

我怎样才能做到这一点？

@WebFilter(urlPatterns = { "/table/*","/user/*", "/contact/*","/run/*","/conf/*"})
public class SessionTimeoutRedirect implements Filter {

    protected final Logger logger = LoggerFactory.getLogger("SessionFilter");

    @Override
    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        if (request.getSession().getAttribute("Id") != null) {
            chain.doFilter(req, res);
        } else {
            logger.debug("session is null:"+request.getRequestURL());                    
            response.sendRedirect(request.getContextPath()+"/login");
        }
    }

    @Override
    public void init(FilterConfig arg0) …

我正在尝试使用git clone从我的webfaction服务器下载代码

$ cd ../webapps/nameofwebapp/
$ git clone git@github.com:github-username/github-repo.git ./

并且有错误:

fatal: destination path '.' already exists and is not an empty directory.

我使用ls,并且有一些东西 nameofwebapp

auth  git.cgi  gitweb.cgi  repos  static

我想问一下在哪里使用git clone 我是否需要创建一个新目录？

我停了一会儿,不知道哪里出错,请帮帮我

这是错误消息:

Warning: App(...): No `render` method found on the returned component instance: you may have forgotten to define `render`.
Uncaught TypeError: inst.render is not a function

这是我的代码:

import React from 'react';
import ReactDOM from 'react-dom';

console.log('Start')

export class App extends React.Component{
  constructor(props) {
     super(props);
     console.log('getInitialState');
     return { status:true }
  }
  toggleState(){
    this.setState({status: !this.state.status})
  }
  render() {
    console.log('render');
        return (
           <div>
              <h1 onClick={this.toggleState}>Hello</h1>
           </div>
        );
     }

} 

ReactDOM.render(<App name='Vipul' />,document.getElementById('app'));

我try except用来避免错误,但我的终端仍显示错误,但没有显示日志消息:

raise ValueError('Missing scheme in request url: %s' % self._url)
exceptions.ValueError: Missing scheme in request url: 

当scrapy没有得到image_urls时,如何避免此错误？
请指导我,非常感谢.

    try:

        item['image_urls'] = ["".join(image.extract()) ]     
    except:
        log.msg("no image foung!. url={}".format(response.url),level=log.INFO)

HTML结构是这样的:

<td class='hey'> 
<a href="https://example.com">First one</a>
</td>

这是我的选择器:

m_URL = sel.css("td.hey a:nth-child(1)[href] ").extract()  

我的选择器现在将输出<a href="https://example.com">First one</a>,但我只希望它输出链接本身:https://example.com.

我怎样才能做到这一点？

我将我的模型字段从Charfiled()更改为GenericIPAddressField()

ip = models.GenericIPAddressField()

并使用django 1.7迁移

./manage.py makemigrations core
./manage.py migrate

但是有错误:

return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column "ip" cannot be cast automatically to type inet
HINT:  Specify a USING expression to perform the conversion.

我试试这个,但不行:

ALTER TABLE core_message ALTER COLUMN ip TYPE inet USING (ip::inet);

错误:

ERROR:  invalid input syntax for type inet: ""

我现在能做什么？
请帮帮我谢谢!