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Rails 4 Authenticity Token

I was working on a new Rails 4 app (on Ruby 2.0.0-p0) when I ran into some authenticity token problems. 13 Answers ...
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git: How to ignore all present untracked files?

Is there a handy way to ignore all untracked files and folders in a git repository? (I know about the .gitignore .) 8 An...
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How to get line count of a large file cheaply in Python?

I need to get a line count of a large file (hundreds of thousands of lines) in python. What is the most efficient way both memory- and time-wise? ...
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Python pandas: fill a dataframe row by row

The simple task of adding a row to a pandas.DataFrame object seems to be hard to accomplish. There are 3 stackoverflow questions relating to this, none of which give a working answer. ...
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Windows batch: echo without new line

What is the Windows batch equivalent of the Linux shell command echo -n which suppresses the newline at the end of the output? ...
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What is state-of-the-art for text rendering in OpenGL as of version 4.1? [closed]

There are already a number of questions about text rendering in OpenGL, such as: 5 Answers ...
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Monad in plain English? (For the OOP programmer with no FP background)

In terms that an OOP programmer would understand (without any functional programming background), what is a monad? 19 Answe...
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CSS3's border-radius property and border-collapse:collapse don't mix. How can I use border-radius to

Edit - Original Title: Is there an alternative way to achieve border-collapse:collapse in CSS (in order to have a collapsed, rounded corner table)? ...
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What are the pros and cons of git-flow vs github-flow? [closed]

We have recently started to use GitLab. 3 Answers 3 ...
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Extract a part of the filepath (a directory) in Python

I need to extract the name of the parent directory of a certain path. This is what it looks like: 7 Answers ...