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How do you divide each element in a list by an int?
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The way you tried first is actually directly possible with numpy:
import numpy
myArray = numpy.array([10,20,30,40,50,60,70,80,90])
myInt = 10
newArray = myArray/myInt
If you do such operations with long lists and especially in any sort of scientific com...
Find first element by predicate
...e stream. It's an intermediate operation, which returns a lazy stream (actually all intermediate operations return a lazy stream). To convince you, you can simply do the following test:
List<Integer> list = Arrays.asList(1, 10, 3, 7, 5);
int a = list.stream()
.peek(num -> Syste...
Why doesn't C# support the return of references?
...f (x > y)
return ref x;
else
return ref y;
}
and then call it with
int a = 123;
int b = 456;
ref int c = ref Max(ref a, ref b);
c += 100;
Console.WriteLine(b); // 556!
I know empirically that it is possible to build a version of C# that supports these features because I hav...
Getting only response header from HTTP POST using curl
... new place. If used together with -i/--include or -I/--head, headers from all requested
pages will be shown. When authentication is used, curl only sends its credentials to the initial host. If a redirect takes curl to a different
host, it won’t be able to intercept the user+pass...
Better to 'try' something and catch the exception or test if it's possible first to avoid an excepti
...est option when the index is probably in the list and the IndexError is usually not raised. This way you avoid the need for an extra lookup by if index < len(my_list).
Python encourages the use of exceptions, which you handle is a phrase from Dive Into Python. Your example not only handles the e...
Proper MIME media type for PDF files
...lication/pdf type should be used - unless you need to be compatible with really old software don't use x-pdf ...
– janniks
Feb 3 at 10:39
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ASP.NET MVC: No parameterless constructor defined for this object
...same exception occurs when a Model has no parameterless constructor.
The call stack was figuring a method responsible for creating a new instance of a model.
System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType)
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Why should I use the keyword “final” on a method parameter in Java?
I can't understand where the final keyword is really handy when it is used on method parameters.
12 Answers
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fatal error: Python.h: No such file or directory
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Looks like you haven't properly installed the header files and static libraries for python dev. Use your package manager to install them system-wide.
For apt (Ubuntu, Debian...):
sudo apt-get install python-dev # for python2.x installs
sudo apt-get insta...
Useful GCC flags for C
Beyond setting -Wall , and setting -std=XXX , what other really useful, but less known compiler flags are there for use in C?
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