小编Ali*_*Ali的帖子

我该如何转换这个字符串:

This string contains the Unicode character Pi(?)

转换为转义的ASCII字符串:

This string contains the Unicode character Pi(\u03a0)

和反之亦然？

C#中可用的当前编码将π字符转换为"？".我需要保留那个角色.

我在app引擎中的目录结构是这样的:

project 
    app.yaml
    main.py
    lib
      markdown
        markdown_files 

降价正在导入中main.py的from lib.markdown import markdown .此时,dev服务器开始给我以下堆栈跟踪.我想知道这里出了什么问题!我在lib中有一个init .py.

Traceback (most recent call last):
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2769, in _HandleRequest
    self._Dispatch(dispatcher, self.rfile, outfile, env_dict)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2654, in _Dispatch
    base_env_dict=env_dict)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 683, in Dispatch
    base_env_dict=base_env_dict)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1718, in Dispatch
    self._module_dict)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1622, in ExecuteCGI
    reset_modules = exec_script(config, handler_path, cgi_path, hook)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 1310, in ExecuteOrImportScript
    exec module_code in script_module.__dict__
  File "/Users/nomadali/jeeqs/git/src/jeeqs.py", line 26, in …

我需要创建一个像NSCache这样的字典,这对于保持cahce来说是线程安全的.但是,偶尔,我需要刷新Cache的内容.NSCache不提供迭代其键的方法.这里会有什么替代方案？NSMutableDictionary与同步？

我正在开发类似于此处的SWT树,但是,我希望能够在某些情况下显示+符号而不是 - 对于扩展的树项目.这可能吗 ？

如果没有,是否有Windows API具有树项目的展开/折叠状态的自定义图标？

我的目标是知道文件是否被其他进程锁定,即使我无权访问该文件!

所以更清楚一点,假设我使用python的内置open()和'wb'开关(用于写入)打开文件.open()将抛出IOError与errno 13(EACCES)if

1. 用户没有该文件的权限或
2. 该文件被另一个进程锁定

我怎样才能在这里检测到案例(2)？

我的目标平台是Windows!