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Python `if x is not None` or `if not x is None`?

I've always thought of the if not x is None version to be more clear, but Google's style guide and PEP-8 both use if x is not None . Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convent...
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What are .NET Assemblies?

... In more simple terms: A chunk of (precompiled) code that can be executed by the .NET runtime environment. A .NET program consists of one or more assemblies. ...
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How do I UPDATE from a SELECT in SQL Server?

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How do I check if a string contains a specific word?

...If you are looking specifically for the word ARE then you would need to do more checks like, for example, check if there is a character or a space before the A and after the E. – jsherk Nov 14 '12 at 21:35 ...
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Check if a number is int or float

... wouldn't issubclass be more generic? – David Heffernan Dec 27 '10 at 19:26 3 ...
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In PHP, what is a closure and why does it use the “use” identifier?

... The use keyword is also used for aliasing namespaces. It's amazing that, more than 3 years after the release of PHP 5.3.0, the syntax function ... use is still officially undocumented, which makes closures an undocumented feature. The doc even confuses anonymous functions and closures. The only (b...
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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)

...† Some people believe that "Destruction is Resource Relinquishment" is a more accurate name for the RAII idiom. share | improve this answer | follow | ...
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How to use double or single brackets, parentheses, curly braces

...ue $ default="hello"; unset var; echo ${var:-$default} hello and several more Also, brace expansions create lists of strings which are typically iterated over in loops: $ echo f{oo,ee,a}d food feed fad $ mv error.log{,.OLD} (error.log is renamed to error.log.OLD because the brace expression ex...
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Include constant in string without concatenating

...is whole thread I went with YOUR particular solution. I wish I could +1 it more than once. – hndcrftd Mar 13 '14 at 23:30 4 ...
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What's the best way to refactor a method that has too many (6+) parameters?

...ionally I come across methods with an uncomfortable number of parameters. More often than not, they seem to be constructors. It seems like there ought to be a better way, but I can't see what it is. ...