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How to “test” NoneType in python?

...ariable has None in it or not. Quoting from is docs, The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value. Since there can be only one instance of None, is would be the preferred way to check...
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What is the difference between Class and Klass in ruby?

What is the difference between Class and Klass? 4 Answers 4 ...
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Vim multiline editing like in sublimetext?

I started to use gvim, and I can't quite understand how the multiline edit works in gvim. 7 Answers ...
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Copy folder recursively, excluding some folders

...ript that will copy the entire contents of a folder including hidden files and folders into another folder, but I want to exclude certain specific folders. How could I achieve this? ...
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The request was aborted: Could not create SSL/TLS secure channel

...12; // Use SecurityProtocolType.Ssl3 if needed for compatibility reasons And now, it works perfectly. ADDENDUM As mentioned by Robin French; if you are getting this problem while configuring PayPal, please note that they won't support SSL3 starting by December, 3rd 2018. You'll need to use TLS...
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What does 'low in coupling and high in cohesion' mean

I have problems understanding the statement low in coupling and high in cohesion . I have googled and read a lot about this, but still finding it hard to understand. ...
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How to remove unwanted space between rows and columns in table?

How do I remove the extra space between the rows and columns in the table. 14 Answers ...
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How to integrate nodeJS + Socket.IO and PHP?

...ntly been looking around, to find a good way to communicate between nodeJS and PHP. Here is the idea : nodeJS is still quite new, and it can be kind of tricky to develop a full application only with it. Moreover, you may need it only for one module of your project, like realtime notifications, chat,...
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Where does mongodb stand in the CAP theorem?

... MongoDB is strongly consistent by default - if you do a write and then do a read, assuming the write was successful you will always be able to read the result of the write you just read. This is because MongoDB is a single-master system and all reads go to the primary by default. If y...
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Different ways of loading a file as an InputStream

...Basically, you have 2 different methods: ClassLoader.getResourceAsStream() and Class.getResourceAsStream(). These two methods will locate the resource differently. In Class.getResourceAsStream(path), the path is interpreted as a path local to the package of the class you are calling it from. For exa...