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How to clear variables in ipython?

Sometimes I rerun a script within the same ipython session and I get bad surprises when variables haven't been cleared. How do I clear all variables? And is it possible to force this somehow every time I invoke the magic command %run? ...
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When to add what indexes in a table in Rails

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How to customise file type to syntax associations in Sublime Text?

I'd like Sublime 2 editor to treat *.sbt files (to highlight syntax) as Scala language, same as *.scala, but I can't find where to set this up. Do you happen to know? ...
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What size should TabBar images be?

I have icons for a tabBar of size 100. 6 Answers 6 ...
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Return type of '?:' (ternary conditional operator)

Why does the first return a reference? 3 Answers 3 ...
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When to use window.opener / window.parent / window.top

In JavaScript when to use window.opener / window.parent / window.top ? 4 Answers ...
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How to check if an object is a certain type

I am passing various objects to a subroutine to run the same process but using a different object each time. For example, in one case I am using a ListView and in another case I am passing a DropDownList. ...
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How to get MD5 sum of a string using python?

In the Flickr API docs , you need to find the MD5 sum of a string to generate the [api_sig] value. 6 Answers ...
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Regular expression for letters, numbers and - _

I'm having trouble checking in PHP if a value is is any of the following combinations 6 Answers ...
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Which parallel sorting algorithm has the best average case performance?

Sorting takes O(n log n) in the serial case. If we have O(n) processors we would hope for a linear speedup. O(log n) parallel algorithms exist but they have a very high constant. They also aren't applicable on commodity hardware which doesn't have anywhere near O(n) processors. With p processors, re...