我正在Android模拟器中执行一些sqlite查询.我想知道数据库文件存储的路径.请给我一些如何找到它的想法.如果你可以提供一些代码片段.
urs,s.kumaran.
我正在为MVC Web应用程序中的HtmlHelper类创建扩展方法.什么都没有显示,甚至没有显示默认的InputExtensions.
public static class HtmlHelpers
{
public static void RegisterScriptInclude(this HtmlHelper htmlhelper, string script)
{
if (!RegisteredScriptIncludes.ContainsValue(script))
{
RegisteredScriptIncludes.Add(RegisteredScriptIncludes.Count, script);
}
}
public static string RenderScripts(this HtmlHelper htmlhelper)
{
var scripts = new StringBuilder();
foreach (string script in RegisteredScriptIncludes.Values)
{
scripts.AppendLine("<script src='" + script + "' type='text/javascript'></script>");
}
return scripts.ToString();
}
private static SortedList<int, string> RegisteredScriptIncludes
{
get
{
SortedList<int, string> value = (SortedList<int, string>)HttpContext.Current.Items["RegisteredScriptIncludes"];
if (value == null)
{
value = new SortedList<int, string>();
HttpContext.Current.Items["RegisteredScriptIncludes"] = value;
} …我一直在阅读布鲁斯·埃克尔在Python中的思考.目前,我正在阅读模式概念章节.在本章中,Eckel展示了python中Singletons的不同实现.但是我对Alex Martelli的Singleton代码(利用继承,而不是私有的嵌套类)有一个不清楚的理解.
这是我对目前代码的理解:
到目前为止我的困惑:
self.__dict__ = self._shared_state; 或者字典的目的许多人提前感谢!
- 三
*更新:每个Singleton对象创建后_shared_state中存储的内容是什么？
#: Alex' Martelli's Singleton in Python
class Borg:
_shared_state = {}
def __init__(self):
self.__dict__ = self._shared_state
class Singleton(Borg):
def __init__(self, arg):
Borg.__init__(self)
self.val = arg
def __str__(self): return self.val
x = Singleton('sausage')
print …如何从列表中删除元素ex: - list = [1 2 3 4]
我想出了一些代码.我想我错了.
(define delete item
(lambda (list)
(cond
((equal?item (car list)) cdr list)
(cons(car list)(delete item (cdr list))))))
尝试使用pickle在python中保存整数列表，遵循许多来源给我的确切方法，但我仍然遇到相同的错误。这是简化版本：
import pickle
a=[0,4,8,[3,5]]
with open(blah.pickle, 'wb') as b:
pickle.dump(a,b)
我总是收到错误：
NameError: name 'blah' is not defined
出了什么问题？
有没有人使用Google翻译API？使用它的最大长度限制是多少？
如何将以下内容转换struct为unsigned char*？
typedef struct {
unsigned char uc1;
unsigned char uc2;
unsigned char uc3;
unsigned char uc5;
unsigned char uc6;
} uchar_t;
uchar_t *uc_ptr = new uchar;
unsigned char * uc_ptr2 = static_cast<unsigned char*>(*uc_ptr);
// invalid static cast at the previous line
今天我和其他朋友谈过,他说他有逻辑编程技巧,所以我很好奇.
我遇到了我的API问题,我无法创建用户记录/将其存储在Google数据存储区中.我收到下面列出的JSON响应.
我发现奇怪的另一件事是当它在右上角使用Google API Explorer时,它有一个红色感叹号,上面写着"方法需要授权".它希望我为用户电子邮件授权OAUTH Scope.
更新:这是我通过GAE获得的错误日志.
Encountered unexpected error from ProtoRPC method implementation: ServerError (Method PhotoswapAPI.user_create expected response type <class 'photoswap_api_messages.UserCreateResponseMessage'>, sent <type 'NoneType'>)
Traceback (most recent call last):
File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/protorpc-1.0/protorpc/wsgi/service.py", line 181, in protorpc_service_app
response = method(instance, request)
File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/endpoints-1.0/endpoints/api_config.py", line 1332, in invoke_remote
return remote_method(service_instance, request)
File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/protorpc-1.0/protorpc/remote.py", line 419, in invoke_remote_method
type(response)))
ServerError: Method PhotoswapAPI.user_create expected response type <class 'photoswap_api_messages.UserCreateResponseMessage'>, sent <type 'NoneType'>
有谁知道如何解决这个问题,它返回503？我错过了什么吗？
503 Service Unavailable
- Hide headers -
cache-control: private, max-age=0
content-encoding: gzip
content-length: …