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Proper way to declare custom exceptions in modern Python?

...tionError(Exception): def __init__(self, message, errors): # Call the base class constructor with the parameters it needs super(ValidationError, self).__init__(message) # Now for your custom code... self.errors = errors That way you could pass dict of error me...
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Numpy - add row to array

...2, 0]]) X = array([[0, 1, 2], [1, 2, 0], [2, 1, 2], [3, 2, 0]]) add to A all rows from X where the first element < 3: import numpy as np A = np.vstack((A, X[X[:,0] < 3])) # returns: array([[0, 1, 2], [0, 2, 0], [0, 1, 2], [1, 2, 0], [2, 1, 2]]) ...
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Where and how is the _ViewStart.cshtml layout file linked?

... Starting with the ASP.NET MVC 3 Beta release, you can now add a file called _ViewStart.cshtml (or _ViewStart.vbhtml for VB) underneath the \Views folder of your project: The _ViewStart file can be used to define common view code that you want to execute at the start of each View’s re...
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The requested operation cannot be performed on a file with a user-mapped section open

...piled in the Debug folder... Strange, isn't it? I found out using a tool called Unlocker. Had to delete with Unlocker, even when it was saying that there was no lock over the file, and I couldn't delete the folder until I didn't delete that single file... After that it compiled. EDIT: I found o...
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std::function vs template

...buggy program to your customer. Moreover, as you correctly pointed out, calls to template functions are resolved statically (i.e. at compile time), so the compiler has all the necessary information to optimize and possibly inline the code (which would not be possible if the call were performed thr...
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How can I have a newline in a string in sh?

...rom the Bash manual page: Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard. Backslash escape sequences, if present, are decoded as follows: \a alert (bell) ...
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How to specify different Debug/Release output directories in QMake .pro file

...ke things even easier to switch around, only define your DESTDIRs conditionally, and then use that value in all your other paths: OBJECTS_DIR = $${DESTDIR}/.obj. Cheers! – Xavier Holt Mar 7 '12 at 4:16 ...
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Source unreachable when using the NuGet Package Manager Console

...lder version and it should work fine. There seems to be still few bugs in VS 2015 related to api.nuget.org (v3). share | improve this answer | follow | ...
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How do I create a self-signed certificate for code signing on Windows?

... -a sha256 -cy authority -sky signature -sv MyCA.pvk MyCA.cer (^ = allow batch command-line to wrap line) This creates a self-signed (-r) certificate, with an exportable private key (-pe). It's named "My CA", and should be put in the CA store for the current user. We're using the SHA-256 al...
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How to push both value and key into PHP array

... it is the faster of the two: array_push vs array[]. Array[] is about 2x as fast if i remember correctly... – jasonflaherty Nov 20 '19 at 18:18 ...