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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...语句提供了一种非常方便的处理方式。一个很好的例子是文件处理,你需要获取一个文件句柄,从文件中读取数据,然后关闭文件句柄。 Without the with statement, one would write something along the lines of: 如果不用with语句,代码如下: f...
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UCenter实现各系统通信的原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...nter实现各系统通信的原理 1、用户登录bbs,通过logging.php文件中,使用函数uc_user_login验证,如果验证成功,将调用函数uc_user_synlogin(位于uc_client下的client.php文件中), 在这个函数中调用 uc_api_post('user', 'synlogin', array('uid'=>$uid));...
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How to find the Windows version from the PowerShell command line

...ws versions use systeminfo. Powershell wrapper: PS C:\> systeminfo /fo csv | ConvertFrom-Csv | select OS*, System*, Hotfix* | Format-List OS Name : Microsoft Windows 7 Enterprise OS Version : 6.1.7601 Service Pack 1 Build 7601 OS Manufacturer : Microsoft Corporation OS...
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OpenSSH升级后不能登录的问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...后,使用客户端怎么都登录不上去 一开始以为是配置文件的问题,把另外一台没升级过的配置文件sshd_config拷贝到本机,不行 寄出百度 http://bbs.51cto.com/thread-1098820-1.html 按照这个说法 修改配置文件后,发现还是不行...
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How to check if a process is running via a batch script

...ere's how I've worked it out: tasklist /FI "IMAGENAME eq notepad.exe" /FO CSV > search.log FOR /F %%A IN (search.log) DO IF %%~zA EQU 0 GOTO end start notepad.exe :end del search.log The above will open Notepad if it is not already running. Edit: Note that this won't find applications hid...
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Log all queries in mysql

...ediumtext NOT NULL, `thread_id` bigint(21) unsigned NOT NULL ) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log' CREATE TABLE `general_log` ( `event_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `user_host` mediumtext NOT NU...
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Windows远程桌面授权错误(授权超时)等报错信息疑难解答 - 更多技术 - 清...

...censing。 3. 在“注册表”菜单上,单击“导出注册表文件”。 4. 在“文件名”框中,键入mslicensingbackup,然后单击“保存”。 5. 如果以后需要还原此注册表项,请双击mslicensingbackup.reg。 6. 在“编辑”菜单上...
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Reading an Excel file in PHP [closed]

...l file. If you want to import it into mysql, you could simply save it as a CSV formatted file and then use fgetcsv to parse it. share | improve this answer | follow ...
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For each row in an R dataframe

...nction is vectorized, then you can skip the loop and just use cat or write.csv: write.csv(data.frame(wellid=getWellID(well$name, well$plate), value1=well$value1, value2=well$value2), file=outputFile) If getWellID() isn't vectorized, then Jonathan's recommendation of using by or knguyen'...
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C++ Lock-free Hazard Pointer(冒险指针) - C/C++ - 清泛网 - 专注C/C++及内核技术

...k add 指令相比也不遑多让。在读多写少的前提下,可以将读写两边的屏障替换为非对称内存屏障,将读部分的开销转移到写部分中。可参考先前内存屏障博文中的介绍。 另一方面,Hazard Pointer 的高性能依赖于平台上线程本地存...