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What is the difference between a URI, a URL and a URN?

...d URIs.) Does the difference between URL and URI have anything to do with what characters are permitted? No. URLs are defined to be a strict subset of URIs. If a parser allows a character in a URL but not in a URI, there is a bug in the parser. The specs go into great detail about which charac...
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How to programmatically take a screenshot on Android?

...e that allowed my screenshot to be stored on an SD card and used later for whatever your needs are: First, you need to add a proper permission to save the file: <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> And this is the code (running in an Activity): priva...
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What is __future__ in Python used for and how/when to use it, and how it works

__future__ frequently appears in Python modules. I do not understand what __future__ is for and how/when to use it even after reading the Python's __future__ doc . ...
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Replace a value in a data frame based on a conditional (`if`) statement

... what if you have multiple columns? – geodex Apr 19 '15 at 21:33 add a comment  | ...
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Detect backspace in empty UITextField

... This apparently doesn't work in ios8 right now, due to what seems like an Apple Bug: devforums.apple.com/message/1045312#1045312 – chug2k Sep 20 '14 at 3:38 1 ...
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What's the difference between “STL” and “C++ Standard Library”?

...he days long before C++ was standardised. C++ existed through the 80s, but what we now call "C++" is the language standardised in ISO/IEC 14882:2014 (and earlier versions, such as ISO/IEC 14882:2011). The STL was already widely used as a library for C++, giving programmers access to containers, ite...
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How to add an empty column to a dataframe?

What's the easiest way to add an empty column to a pandas DataFrame object? The best I've stumbled upon is something like ...
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CFBundleVersion in the Info.plist Upload Error

...r that appears in iTunes - you can put anything you want there, and that's what your users will see ...except, if you also report the "actual" version number inside your app, the user will see the CFBundleVersion (usually, depends how you code it), rather than the iTunes version (which - I think - c...
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Yank entire file

... What does the + do, please? – VoY Dec 16 '10 at 8:57 5 ...
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Node.js + Nginx - What now?

...erver. Therefore you need to setup an nginx config file for node. This is what I have done in my Ubuntu box: Create the file yourdomain.com at /etc/nginx/sites-available/: vim /etc/nginx/sites-available/yourdomain.com In it you should have something like: # the IP(s) on which your node server...