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How do I check if a variable exists?

...cending speech. Some of us use Python for simple mathematics or statistics scripts using IDEs such as Spyder which work like Matlab. It makes sense sometimes in those environments to allow the user to define variables in the global console and check otherwise if they are undeclared in the script lik...
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How can I listen for a click-and-hold in jQuery?

...ener').on('clickHold', function() { console.log('Worked!'); }); <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script> <img src="http://lorempixel.com/400/200/" id="HoldListener"> See on JSFiddle Now you need just to set the time of holding and add clic...
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“android.view.WindowManager$BadTokenException: Unable to add window” on buider.show()

...d to call an inner class and in a method within the class, I need to show AlertDialog . After dismissing it, when the OK button is pressed, forward to Google Play for purchase. ...
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Configure Flask dev server to be visible across the network

... how to access the flask script globally, hosting on my own server – pyd Jul 12 '18 at 10:37 ...
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How can I create a unique constraint on my column (SQL Server 2008 R2)?

... Great. Also you can add multiple columns in the TSQL script like this: alter table your_table add constraint pinky unique(yourcolumn, yourcolumn_2); – Jordan Sep 12 '19 at 15:53 ...
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为iFrame添加动态载入效果,提高用户体验 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...no" border="0" marginwidth="0" marginheight="0" scrolling="no"></iframe> <script language="javascript"> function stateChangeIE(_frame) { if (_frame.readyState=="interactive") { var loader = document.getElementById("loading"); loader.innerHTML = ""; ...
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SVN: Is there a way to mark a file as “do not commit”?

...commit! I work on the linux command-line: so my solution is to create a script /usr/bin/svnn (yes, with two 'n's!) as follows: #! /bin/bash DIR=/home/mike/dev/trunk IGNORE_FILES="\ foo/pom.xml \ foo/src/gwt/App.gwt.xml \ foo/src/main/java/gwt/Common.gwt.xml \ foo...
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How to get all groups that a user is a member of?

...n't necessarily work on a client machine where you're running a PowerShell script, or on downlevel clients. If you want to do that, use this solution. – Daniel.S Oct 22 '14 at 23:27 ...
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Git status ignore line endings / identical files / windows & linux environment / dropbox / mled

... I created a script to ignore differences in line endings: It will display the files which are not added to the commit list and were modified (after ignoring differences in line endings). You can add the argument "add" to add those files...
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How can I open a link in a new window?

... with &lt;a href="myurl.html" target="_blank"&gt;My Link&lt;/a&gt;? No Javascript needed... share | improve this answer | follow | ...