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How do I check if a variable exists?

...efined is actually a bad thing in any language" Spare me the condescending 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 c...
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jQuery UI sliders on touch devices

... to add some new info about this. Touch-punch will work fine for Ipads and Android devices. But the slider will not work on Windows mobile devices, as far is I could test(with the latest versions of jquery ui & Touch punch) The fix is quite simple, just add the following CSS-rules to the .ui-s...
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GPL and LGPL open source licensing restrictions [closed]

...d with a compatible license. The GPL/LGPL licenses mean "free" as in "free speech", not "free beer". You can create a derivative work and sell it for large amounts of money, but you must comply with the GPL/LGPL. share ...
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How can I get form data with JavaScript/jQuery?

...o push enter on fields. Some people use alternative input devices such as speech input or other accessibility devices. Handle the form submit and you correctly solve it for everyone. We're digging into the form data for the actual form that was submitted. If you change your form selector later, y...
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Starting python debugger automatically on error

...er, but probably just as useful(?) I know I heard Guido mention this in a speech somewhere. I just checked python -?, and if you use the -i command you can interact where your script stopped. So given this script: testlist = [1,2,3,4,5, 0] prev_i = None for i in testlist: if not prev_i: ...
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What does “for” attribute do in HTML tag?

...control. The association between a label and a control may also be used by speech-based user agents, which may give the user a way to ask what the associated label is, when dealing with a control. (The association may not be as obvious as in visual rendering.) In the first example in the question (...
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Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Wh

... Still experiencing the problem in Android Studio (2.2p3) after editing ~/.zshrc and ~/.bashrc – Mic Fok Jun 21 '16 at 16:52 ...
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What should I set JAVA_HOME environment variable on macOS X 10.6?

...ng MAC OS X(Sierra) 10.12.2. I set JAVA_HOME to work on React Native(for Android apps) by following the following steps. Open Terminal (Command+R, type Terminal, Hit ENTER). Add the following lines to ~/.bash_profile. export JAVA_HOME=$(/usr/libexec/java_home) Now run the following command. ...
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Disable Auto Zoom in Input “Text” tag - Safari on iPhone

... This will break android devices zooming ability – fen1ksss Aug 14 '18 at 14:52 4 ...
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Check if an image is loaded (no errors) with jQuery

...e, mac os 10.12 Safari, mac os 10.12 Firefox, Google Pixel 7.1, Samsung S5 Android 4.4. Don't forget to use addEventListener/removeEventListener too :D – danjah Dec 9 '16 at 3:00 ...