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Error type 3 Error: Activity class {} does not exist

... uninstall properly. To verify and fix this: Go to Settings. Go to Apps. Select your app. (here, you can verify that your app is not uninstalled properly). Open the overflow menu on the top right and select Uninstall for all users. Done. Try to install then launch your app again. ...
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RuntimeError on windows trying python multiprocessing

...void creating subprocesses recursively. Modified testMain.py: import parallelTestModule if __name__ == '__main__': extractor = parallelTestModule.ParallelExtractor() extractor.runInParallel(numProcesses=2, numThreads=4) ...
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Python __str__ versus __unicode__

...onfusing, but in 2.x we're stuck with them for compatibility reasons. Generally, you should put all your string formatting in __unicode__(), and create a stub __str__() method: def __str__(self): return unicode(self).encode('utf-8') In 3.0, str contains characters, so the same methods are nam...
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Inspect element that only appear when other element is mouse overed/entered

...to the Elements panel and use the magnifying glass icon in the top left to select the tooltip If the tooltip shows up because of CSS, here's what you can do in that case: Step-by-step: Open the DevTools Select the triggering element in the dev tools (the link) Right click, and select "force el...
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hasNext in Python iterators?

...thod to put the first element back after I have checked that it exists by calling next(). – Giorgio Dec 24 '12 at 20:26 16 ...
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Multiple variables in a 'with' statement?

...textlib.nested, this guarantees that a and b will have their __exit__()'s called even if C() or it's __enter__() method raises an exception. You can also use earlier variables in later definitions (h/t Ahmad below): with A() as a, B(a) as b, C(a, b) as c: doSomething(a, c) ...
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What is Virtual DOM?

...nd what react does it look for the the reference in its object model tree, select the real node in the html and tinker with it. The sound is great virtual dom, but it's nothing fancy and overhype. – syarul Feb 15 '17 at 1:07 ...
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jQuery 'input' event

...by itself will not trigger the event, but Ctrl-V to paste some text will), selecting an auto-completion option, Linux-style middle-click paste, drag-and-drop, and lots of other things. See this page and the comments on this answer for more details. ...
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How do you access a website running on localhost from iPhone browser

...) Go to the "Info" tab Click on the drop down menu that says "Wi-Fi" and select "iPhone USB" as shown in the photo. You'll find an IP address like "xxx.xxx.xx.xx" or similar. Open Safari browser on your iPhone and enter IP_address:port_number Example: 169.254.72.86:3000 [NOTE: If the IP addr...
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Empty Visual Studio Project?

...oject won't do a 'damn' thing either when you go to Project Properties and select Utility under Configuration Type under the General tab. – Abel Feb 2 '10 at 16:17 ...