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Should I use scipy.pi, numpy.pi, or math.pi?

In a project using SciPy and NumPy, should I use scipy.pi , numpy.pi , or math.pi ? 2 Answers ...
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How to add custom validation to an AngularJS form?

I have a form with input fields and validation setup by adding the required attributes and such. But for some fields I need to do some extra validation. How would I "tap in" to the validation that FormController controls? ...
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MySQL: how to get the difference between two timestamps in seconds

Is there a way I can make a query in MySQL that will give me the difference between two timestamps in seconds, or would I need to do that in PHP? And if so, how would I go about doing that? ...
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Flatten List in LINQ

I have a LINQ query which returns IEnumerable<List<int>> but i want to return only List<int> so i want to merge all my record in my IEnumerable<List<int>> to only one array. ...
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How do I get and set Environment variables in C#?

How can I get Environnment variables and if something is missing, set the value? 6 Answers ...
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Python: Get the first character of the first string in a list?

How would I get the first character from the first string in a list in Python? 4 Answers ...
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List of Java class file format major version numbers?

I saw this list of major version numbers for Java in another post: 4 Answers 4 ...
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Rails 4: before_filter vs. before_action

In rails >4.0.0 generators creates CRUD operations with before_action not before_filter . It seems to do the same thing. So what's the difference between these two? ...
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How to write one new line in Bitbucket markdown?

Is it possible to write a new line (NOT a paragraph) in the Bitbucket markdown? 5 Answers ...
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How to write multiple line property value using PropertiesConfiguration?

...a property with a List value (comma separated), how to write this property in a multi-line ? (backslash after the comma)? 4...