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What is a None value?

I have been studying Python, and I read a chapter which describes the None value, but unfortunately this book isn't very clear at some points. I thought that I would find the answer to my question, if I share it there. ...
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What's the Point of Multiple Redis Databases?

So, I've come to a place where I wanted to segment the data I store in redis into separate databases as I sometimes need to make use of the keys command on one specific kind of data, and wanted to separate it to make that faster. ...
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Android Studio says “cannot resolve symbol” but project compiles

I'm importing twitter4j in AndroidStudio, using the following in my build.gradle: 27 Answers ...
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Two submit buttons in one form

I have two submit buttons in a form. How do I determine which one was hit serverside? 19 Answers ...
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What's the difference between emulation and simulation? [duplicate]

In simple understandable terms, what is the difference between the two terms? 10 Answers ...
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How to set a JavaScript breakpoint from code in Chrome?

I want to force the Chrome debugger to break on a line via code , or else using some sort of comment tag such as something like console.break() . ...
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Best practices to handle routes for STI subclasses in rails

My Rails views and controllers are littered with redirect_to , link_to , and form_for method calls. Sometimes link_to and redirect_to are explicit in the paths they're linking (e.g. link_to 'New Person', new_person_path ), but many times the paths are implicit (e.g. link_to 'Show', person ...
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Why is Java's boolean primitive size not defined?

The Java Virtual Machine Specification says that there is limited support for boolean primitive types. 7 Answers ...
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How to select all instances of a variable and edit variable name in Sublime

If I select a variable (not just any string) in my code, all other instances of that variable get a stroke (white outline) around them: ...
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Difference between private, public, and protected inheritance

... To answer that question, I'd like to describe member's accessors first in my own words. If you already know this, skip to the heading "next:". There are three accessors that I'm aware of: public, protected and private. Let: class Base { public: int publicMember; protected: ...