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using gitignore to ignore (but not delete) files

I have a tmp directory in my git repo I'd like to still exist, but be ignored. I added it to .gitignore , but git status still tells me about changes to files in that directory. I tried git rm -r --cached , but that removes it from the remote repo. How can I stop tracking changes to this dire...
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Python - write() versus writelines() and concatenated strings

So I'm learning Python. I am going through the lessons and ran into a problem where I had to condense a great many target.write() into a single write() , while having a "\n" between each user input variable(the object of write() ). ...
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What's the difference between an exclusive lock and a shared lock?

According to wikipedia, 4 Answers 4 ...
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Difference between size_t and std::size_t

What are the differences between size_t and std::size_t in terms of where they are declared, when they should be used and any other differentiating features? ...
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What is the purpose of AsQueryable()?

Is the purpose of AsQueryable() just so you can pass around an IEnumerable to methods that might expect IQueryable , or is there a useful reason to represent IEnumerable as IQueryable ? For example, is it supposed to be for cases like this: ...
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font-style: italic vs oblique in CSS

What is the difference between these two: 5 Answers 5 ...
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Why JSF saves the state of UI components on server?

Now, it is no longer necessary to save state while using JSF. A high performance Stateless JSF implementation is available for use. See this blog & this question for relevant details & discussion. Also, there is an open issue to include in JSF specs, an option to provide stateless mode for JSF...
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Does MySQL ignore null values on unique constraints?

I have an email column that I want to be unique. But I also want it to accept null values. Can my database have 2 null emails that way? ...
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?

In Bluebird's util.js file , it has the following function: 1 Answer 1 ...
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Mock vs MagicMock

My understanding is that MagicMock is a superset of Mock that automatically does "magic methods" thus seamlessly providing support for lists, iterations and so on... Then what is the reason for plain Mock existing? Isn't that just a stripped down version of MagicMock that can be practically ...