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Why aren't python nested functions called closures?

I have seen and used nested functions in Python, and they match the definition of a closure. So why are they called nested functions instead of closures ? ...
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Among $_REQUEST, $_GET and $_POST which one is the fastest?

...ST, by default, contains the contents of $_GET, $_POST and $_COOKIE. But it's only a default, which depends on variables_order ; and not sure you want to work with cookies. If I had to choose, I would probably not use $_REQUEST, and I would choose $_GET or $_POST -- depending on what my applicati...
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Is there any difference between __DIR__ and dirname(__FILE__) in PHP?

It looks the same for me,but I'm not sure, 1 Answer 1 ...
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Are nested try/except blocks in python a good programming practice?

I'm writing my own container, which needs to give access to a dictionary inside by attribute calls. The typical use of the container would be like this: ...
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unique object identifier in javascript

...in javascript, so I can see if they are the same. I don't want to use equality operators, I need something like the id() function in python. ...
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Python constructors and __init__

...ion overloading in Python, meaning that you can't have multiple functions with the same name but different arguments. In your code example, you're not overloading __init__(). What happens is that the second definition rebinds the name __init__ to the new method, rendering the first method inaccessi...
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Why is “if not someobj:” better than “if someobj == None:” in Python?

... In the first test, Python try to convert the object to a bool value if it is not already one. Roughly, we are asking the object : are you meaningful or not ? This is done using the following algorithm : If the object has a __nonzero__ special method (as do numeric built-ins, int and float), it...
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How to access outer class from an inner class?

I have a situation like so... 11 Answers 11 ...
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Get the full URL in PHP

...' ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"; Editor's note: using this code has security implications. The client can set HTTP_HOST and REQUEST_URI to any arbitrary value it wants. share ...
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Header files for x86 SIMD intrinsics

...or the different x86 SIMD instruction set extensions (MMX, SSE, AVX, ...)? It seems impossible to find such a list online. Correct me if I'm wrong. ...