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Why does += behave unexpectedly on lists?

The += operator in python seems to be operating unexpectedly on lists. Can anyone tell me what is going on here? 8 Answe...
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Replace whitespaces with tabs in linux

How do I replace whitespaces with tabs in linux in a given text file? 10 Answers 10 ...
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Color Tint UIButton Image

I noticed that when I place a white or black UIImage into a UISegmentedControl it automatically color masks it to match the tint of the segmented control. I thought this was really cool, and was wondering if I could do this elsewhere as well. For example, I have a bunch of buttons that have a un...
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How do you check that a number is NaN in JavaScript?

I’ve only been trying it in Firefox’s JavaScript console, but neither of the following statements return true: 30 Answe...
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How to create a WPF Window without a border that can be resized via a grip only?

If you set ResizeMode="CanResizeWithGrip" on a WPF Window then a resize grip is shown in the lower right corner, as below: ...
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async/await - when to return a Task vs void?

Under what scenarios would one want to use 7 Answers 7 ...
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HTML: How to limit file upload to be only images?

With HTML, how do I limit what kind of filetypes can be uploaded? 9 Answers 9 ...
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How to change menu item text dynamically in Android

I'm trying to change the title of a menu item from outside of the onOptionsItemSelected(MenuItem item) method. 11 Answers...
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How would I run an async Task method synchronously?

I'm learning about async/await, and ran into a situation where I need to call an async method synchronously. How can I do that? ...
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How to validate an OAuth 2.0 access token for a resource server?

When a client asks a resource server to get a protected resource with an OAuth 2.0 access token, how does this server validate the token? The OAuth 2.0 refresh token protocol? ...