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Socket send函数和recv函数详解以及利用select()函数来进行指定时间的阻塞 ...
...阻塞int send( SOCKET s, const char FAR *buf, int len, int flags ); 不论是客户还是服务器应用程序都用send函数来向TCP连接的...int send( SOCKET s, const char FAR *buf, int len, int flags );
不论是客户还是服务器应用程序都用send函数来向TCP连接的另一端发...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...question) one way to do this is to use the drop method:
df = df.drop(some labels)
df = df.drop(df[<some boolean condition>].index)
Example
To remove all rows where column 'score' is < 50:
df = df.drop(df[df.score < 50].index)
In place version (as pointed out in comments)
df.drop(d...
What do the &,
...
&default means you're labeling this set of attributes with some name for later use
<<: *default means you're including all attributes from group labeled as default
...
Why does Lua have no “continue” statement?
...ontinue" was properly supported) It's a bit prettier and safer than a goto label though, since for that name clashes might need to be avoided for nested loops.
– E. T.
Aug 21 '14 at 2:28
...
Squash my last X commits together using Git
... @Adam: Basically, this means use the GUI interface of gitk to label the line of code that you are squashing and also label the base upon which to squash to. In the normal case, both of these labels will already exist, so step (1) can be skipped.
– Brent Bradburn
...
How to change variables value while debugging with LLDB in Xcode?
... One more little question: I'm doing this to try to change the text of a UILabel: 'expr myLabel.text = @"hello!" but I get an error: property 'text' not found on object of type 'UILabel *'... Any thoughts?
– Eric
Mar 28 '12 at 13:32
...
jQuery if checkbox is checked
...y>
<input id="check1" type="checkbox" checked="checked">
<label for="check1">Check me</label>
<p></p>
</body>
</html>
share
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impro...
Apache两种工作模式区别及配置切换 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...置
如果不用“--with-mpm”显式指定某种MPM，prefork就是Unix平台上缺省的MPM。它所采用的预派生子进程方式也是Apache 1.3中采用的模式。prefork本身并没有使用到线程，2.0版使用它是为了与1.3版保持兼容性；另一方面，prefork用单...
云数据及Firebase组件简介 · App Inventor 2 中文网
...数据和FirebaseDB组件简介
1 月 24 日：Firebase 组件和云数据是 App Inventor 的一项实验性功能。 我们正在发布一些初步文档，以便人们可以在我们开发此功能时尝试该功能。 我们欢迎并鼓励您以此构建应用程序以供实验使用，但请...
云数据及Firebase组件简介 · App Inventor 2 中文网
...数据和FirebaseDB组件简介
1 月 24 日：Firebase 组件和云数据是 App Inventor 的一项实验性功能。 我们正在发布一些初步文档，以便人们可以在我们开发此功能时尝试该功能。 我们欢迎并鼓励您以此构建应用程序以供实验使用，但请...