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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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Chrome ignores autocomplete=“off”

...t).ready(function() { addField(); addField('Field 1: '); }); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form id="form"></form> Works in: Chrome: 49+ Firefox: 44+ ...
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Preloading CSS Images

...t delayed until after the main content has loaded, which would require Javascript. But unless you're preloading dozens of images, this shouldn't be a deal-breaker. – Benjamin Aug 17 '13 at 13:42 ...
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Get list of all routes defined in the Flask app

...pp import app >>> app.url_map The first 'app' is my project script: app.py, another is my web's name. (this solution is for tiny web with a little route) share | improve this answer ...
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How can I use PHP to dynamically publish an ical file to be read by Google Calendar?

...not mistaken. Programs use the UID to see if an event is deleted. If a php-script always generates another UID (->mt_rand), programs will always think the whole content has changed. Everything vanished and everything is new. Personally I would stick to the same UID if the event is the same in th...
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ngClass style with dash in key

...lt;button ng-click="action()">click me</button> </div> <script> function DeathrayMenuController($scope) { $scope.status=true $scope.action= function(){ $scope.status=!$scope.status } } </script> ...
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Unix tail equivalent command in Windows Powershell

...ason not documented well in v2. Here is an example Get-Content -Path "C:\scripts\test.txt" -Wait Once you run this, update and save the file and you will see the changes on the console. share | ...
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“No X11 DISPLAY variable” - what does it mean?

...Ubuntu 14.04.01 when I tried to install JDK 8 and Netbeans if I launch the script inside a Byobu terminal (maybe with Screens happens the same). Just exit Byobu and (in a graphical terminal) run the script. share |...
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PHP code is not being executed, instead code shows on the page

...ppens when PHP7 doesn't configure the default fast-CGI service in the make script. sudo a2enmod proxy_fcgi setenvif creates three new mods /mods-available/proxy.conf proxy_fcgi.load proxy.load Likewise, sudo a2enconf php7.0-fpm creates a config file /conf-available/php7.0-fpm.conf Once this is done ...
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Integrated Markdown WYSIWYG text editor

... Hallo allows WYSIWYG editing of the HTML inside a <div>. I used javascript to hide any <textarea> blocks that have a specific wysiwyg CSS class, replacing it with a <div> and copying the contents of the <textarea> into the <div>. The copying runs through Showdown which...