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What is the meaning of single and double underscore before an object name?

Can someone please explain the exact meaning of having leading underscores before an object's name in Python, and the difference between both? ...
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HTML5 canvas ctx.fillText won't do line breaks?

I can't seem to be able to add text to a canvas if the text includes "\n". I mean, the line breaks do not show/work. 17 Ans...
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What is the difference between Polymer elements and AngularJS directives?

On the Polymer Getting Started page, we see an example of Polymer in action: 10 Answers ...
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What is the relationship between Looper, Handler and MessageQueue in Android?

I have checked the official Android documentation/guide for Looper , Handler and MessageQueue . But I couldn't get it. I am new to android, and got very confused with these concepts. ...
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python max function using 'key' and lambda expression

I come from OOP background and trying to learn python. I am using the max function which uses a lambda expression to return the instance of type Player having maximum totalScore among the list players . ...
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How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?

On POSIX systems, termination signals usually have the following order (according to many MAN pages and the POSIX Spec): 6 ...
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How do I analyze a program's core dump file with GDB when it has command-line parameters?

My program operates like this: 9 Answers 9 ...
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What goes into the “Controller” in “MVC”?

I think I understand the basic concepts of MVC - the Model contains the data and behaviour of the application, the View is responsible for displaying it to the user and the Controller deals with user input. What I'm uncertain about is exactly what goes in the Controller. ...
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design a stack such that getMinimum( ) should be O(1)

...tion. You need to design a stack which holds an integer value such that getMinimum() function should return the minimum element in the stack. ...
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Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?

I just found a comment in this answer saying that using iostream::eof in a loop condition is "almost certainly wrong". I generally use something like while(cin>>n) - which I guess implicitly checks for EOF. ...