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Why do some functions have underscores “__” before and after the function name?

...rms using leading or trailing underscores are recognized (these can generally be combined with any case convention): _single_leading_underscore: weak "internal use" indicator. E.g. from M import * does not import objects whose name starts with an underscore. single_trailing_underscore_: ...
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Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V

...rough for i up to n, doing two things: pressing A once and pressing select all + copy followed by paste j times (actually j-i-1 below; note the trick here: the contents are still in the clipboard, so we can paste it multiple times without copying each time). We only have to consider up to 4 consecut...
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Complete Working Sample of the Gmail Three-Fragment Animation Scenario?

...at I'll refer to as "the Gmail three-fragment animation" scenario. Specifically, we want to start with two fragments, like this: ...
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Is there any way to kill a Thread?

... It is generally a bad pattern to kill a thread abruptly, in Python and in any language. Think of the following cases: the thread is holding a critical resource that must be closed properly the thread has created several other threads ...
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What is the difference between JVM, JDK, JRE & OpenJDK?

...hat contain the bytecodes understood by the JVM. It's also the entity that allows Java to be a "portable language" (write once, run anywhere). Indeed, there are specific implementations of the JVM for different systems (Windows, Linux, macOS, see the Wikipedia list), the aim is that with the same by...
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Should I be using object literals or constructor functions?

....bar; } However, this is not favorable with regards to encapsulation: Ideally, all the data + behaviour associated with an entity should live together. share | improve this answer | ...
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Finding all possible combinations of numbers to reach a given sum

How would you go about testing all possible combinations of additions from a given set N of numbers so they add up to a given final number? ...
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Ruby: How to post a file via HTTP as multipart/form-data?

...o an HTTP POST that looks like an HMTL form posted from a browser. Specifically, post some text fields and a file field. 12...
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curl json post request via terminal to a rails app

I'm trying to create a user on my rails app with a curl command from os x terminal. No matter how I format the data, the app returns a responses that non of my validations have passed. ...
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How do I enter RGB values into Interface Builder?

... Interface Builder? I can select predefined colors but I would like to manually enter in RGB values. Where can I do this? 5...