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In mongoDb, how do you remove an array element by its index?
...}, {'$pull': {"interests": "guitar"}})
Also, you may consider using $pullAll for removing all occurrences. More about this on the official documentation page - http://www.mongodb.org/display/DOCS/Updating#Updating-%24pull
This doesn't use index as a criteria for removing an element, but still mig...
How to make an unaware datetime timezone aware in python
...ize(unaware)
assert aware == now_aware
For the UTC timezone, it is not really necessary to use localize since there is no daylight savings time calculation to handle:
now_aware = unaware.replace(tzinfo=pytz.UTC)
works. (.replace returns a new datetime; it does not modify unaware.)
...
Send an Array with an HTTP Get
... to do with it
– omnomnom
Sep 22 at 16:15
This is indeed unspecified. That's exactly why the answer says "Generally". ...
java.lang.UnsupportedClassVersionError: Bad version number in .class file?
...n I include an opensource library that I had to compile from source. Now, all the suggestions on the web indicate that the code was compiled in one version and executed in another version (new on old). However, I only have one version of JRE on my system. If I run the commands:
...
“Collection was mutated while being enumerated” on executeFetchRequest
...nator:[self.managedObjectContext persistentStoreCoordinator]];
...in the _importData method (just before to register the controller as observer for the notification) solves the problem.
Thanks for your help, Peter. And thanks to Fred McCann's for its valuable blog post !
...
10 条真心有趣的 Linux 命令 - 创意 - 清泛网 - 专注C/C++及内核技术
...rank@crank-System:~$ sudo apt-get install fortune
利用fortune命令的_s选项，他会限制一个句子的输出长度。
# fortune -s
3.yes
# yes <string>
这个命令会不停打印字符串，直到用户把这进程给结束掉。
# yes unixmen
4.figlet
这个命令可以...
CDHtmlDialog的基本使用（JS调用C++函数的实现） - C/C++ - 清泛网 - 专注IT技能提升
CDHtmlDialog的基本使用（JS调用C++函数的实现）CDHtmlDialog_js_call_cpp_interactiveCDHtmlDialog JS C++一、建立一个新的MFC Application工程，在下面这一步把HTML Dialog给勾上：二、修改工程中的JSCppInteractive.htm，代码如下：<HTML><HEA...一、建立一个...
C语言判断文件是否存在 - C/C++ - 清泛网 - 专注C/C++及内核技术
... <stdlib.h>
void main( void )
{
/* Check for existence */
if( (_access( "ACCESS.C", 0 )) != -1 )
{
printf( "File ACCESS.C exists\n" );
/* Check for write permission */
if( (_access( "ACCESS.C", 2 )) != -1 )
printf( "File ACCESS.C has write permission\n"...
scoped_ptr 与 auto_ptr 与 shared_ptr 区别总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
scoped_ptr 与 auto_ptr 与 shared_ptr 区别总结1.auto_ptr 被复制后，将失去原来所致资源的所有权；2.scoped_ptr永远不能被复制或被赋值！scoped_ptr拥有它所指向的资源的所有权，并永远不会放弃这个所有权；3.shared_ptr 是可以共享所有权的...
boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
boost自定义composite_key_compare比较函数composite_key_compare指定boost多容器元素的比较方法，当然我们也可以自定义比较函数。另外，如果调试过程中遇到很奇怪的问题，可以在自定义比较函数中下断点进行调试。
// boost_demo.cpp : 定义...