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How to create module-wide variables in Python? [duplicate]
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Here is what is going on.
First, the only global variables Python really has are module-scoped variables. You cannot make a variable that is truly global; all you can do is make a variable in a particular scope. (If you make a variable inside the Python interpreter, and then import other mo...
Can a decorator of an instance method access the class?
I have something roughly like the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition.
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How do exceptions work (behind the scenes) in c++
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Instead of guessing, I decided to actually look at the generated code with a small piece of C++ code and a somewhat old Linux install.
class MyException
{
public:
MyException() { }
~MyException() { }
};
void my_throwing_function(bool throwit)
{
if (...
compareTo() vs. equals()
...ified object.
compareTo compares two strings by their characters (at same index) and returns an integer (positive or negative) accordingly.
String s1 = "ab";
String s2 = "ab";
String s3 = "qb";
s1.compareTo(s2); // is 0
s1.compareTo(s3); // is -16
s3.compareTo(s1); // is 16
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Choice between vector::resize() and vector::reserve()
...ave an upper bound. Of course when in doubt, with vectors you can just use indexes instead of iterators, the difference is usually negligible.
– Steve Jessop
Sep 13 '11 at 9:33
4
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Underscore vs Double underscore with variables and methods [duplicate]
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Explanation:
People coming from a C++/Java background are especially prone to
overusing/misusing this "feature". But __private names don't work the
same way as in Java or C++. They just trigger a name mangling whose
purpose is to prevent accidental namespace collisions in subclasses...
How to sum up an array of integers in C#
...If you don't prefer LINQ, it is better to use foreach loop to avoid out of index.
int[] arr = new int[] { 1, 2, 3 };
int sum = 0;
foreach (var item in arr)
{
sum += item;
}
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Accessing dict keys like an attribute?
...__init__(*args, **kwargs)
self.__dict__ = self
Some pros:
It actually works!
No dictionary class methods are shadowed (e.g. .keys() work just fine. Unless - of course - you assign some value to them, see below)
Attributes and items are always in sync
Trying to access non-existent key as an...
List attributes of an object
...ict__
Then you can test what type is with type() or if is a method with callable().
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Run Java Code Online [closed]
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http://ideone.com/ideone/Index/submit/
you can run your java code
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