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Is there a generic constructor with parameter constraint in C#?
...neric object, the type still needs the correct constructor declared or an exception will be thrown. You can pass in any argument as long as they match one of the constructors.
Used this way you cannot put a constraint on the constructor in the template.
If the constructor is missing, an exception n...
Eclipse executable launcher error: Unable to locate companion shared library
...was the step I forgot.. After unzipping the install package I clicked the executable and Eclipse opened up just as I had left it (it remembered which files I had open) - I did have to re-install the ADT plugin though. Strange situation, I still have absolutely no idea what happened.
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ASP.NET MVC: Custom Validation by DataAnnotation
... protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var properties = this.PropertyNames.Select(validationContext.ObjectType.GetProperty);
var values = properties.Select(p => p.GetValue(validationContext.ObjectInstance, null)).OfTy...
What is getattr() exactly and how do I use it?
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getattr(object, 'x') is completely equivalent to object.x.
There are only two cases where getattr can be useful.
you can't write object.x, because you don't know in advance which attribute you want (it comes from a string). Very useful f...
How to print a dictionary line by line in Python?
...
for x in cars:
print (x)
for y in cars[x]:
print (y,':',cars[x][y])
output:
A
color : 2
speed : 70
B
color : 3
speed : 60
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How to efficiently concatenate strings in go
... copy, and read the other answers instead.
In my tests, that approach is ~3x faster than using bytes.Buffer and much much faster (~12,000x) than using the operator +. Also, it uses less memory.
I've created a test case to prove this and here are the results:
BenchmarkConcat 1000000 64497 ns/op...
chart.js load totally new data
...r chart.js allows one to edit points of the datasets loaded into it, for example:
19 Answers
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Finding the source code for built-in Python functions?
...can be found in the Objects sub-directory of the Python source trunk. For example, see here for the implementation of the enumerate class or here for the implementation of the list type.
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imp...
How do I install pip on macOS or OS X?
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If you are behind a proxy, make sure http_proxy and https_proxy are set correctly, then use the '-E' option with sudo: sudo -E easy_install pip
– Neil Schaper
Aug 4 '14 at 20:10
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Best way to get InnerXml of an XElement?
What's the best way to get the contents of the mixed body element in the code below? The element might contain either XHTML or text, but I just want its contents in string form. The XmlElement type has the InnerXml property which is exactly what I'm after.
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