tuples

Just for curiosity, it's not a 'I must have it', but how declare a tuple using system.tuple class in powershell? I'm using powershell.exe.config to load framework 4.0 but I'm not able to create a tuple. Trying this: PS C:\ps1> $a = [System.Tuple``2]::Create( "pino", 34) Chiamata al metodo non riuscita. [System.Tuple`2] non contiene un metodo denominato 'Create'. In riga:1 car:31 + $a = [System.Tuple``2]::Create <<<< ( "pino", 34) + CategoryInfo : InvalidOperation: (Create:String) [], RuntimeException + FullyQualifiedErrorId : MethodNotFound sorry for Italian sample... Thank you for help. EDIT:

I'm writing a custom iterator that, when dereferenced returns a tuple of references. Since the tuple itself is ephemeral, I don't think I can return a reference from operator*(). I think my iterator makes sense semantically, since it has reference semantics, even though operator* returns a value. The issue is, when I try to call std::swap (or rather, when std::sort does), like below, I get errors because the swap expects l-values. Is there an easy fix to this problem? #include <vector> class test { public: test() :v1(10), v2(10) {} class iterator { public: iterator(std::vector<int>& _v1, std:

Let's preface this question by saying that you should use __new__ instead of __init__ for subclassing immutable objects . With that being said, let's see the following code: class MyTuple(tuple): def __init__(self, *args): super(MyTuple, self).__init__(*args) mytuple = MyTuple([1,2,3]) This works in python2, but in python3 I get: Traceback (most recent call last): File "tmp.py", line 5, in <module> mytuple = MyTuple([1,2,3]) File "tmp.py", line 3, in __init__ super(MyTuple, self).__init__(*args) TypeError: object.__init__() takes no parameters Why does this happen? What changed in python3?

I have a function that returns a tuple that, among others, contains a float value. Usually I use assertAlmostEquals to compare those, but this does not work with tuples. Also, the tuple contains other data-types as well. Currently I am asserting every element of the tuple individually, but that gets too much for a list of such tuples. Is there any good way to write assertions for such cases? Consider this function: def f(a): return [(1.0/x, x * 2) for x in a] Now I want to write a test for it: def testF(self): self.assertEqual(f(range(1,3)), [(1.0, 2), (0.5, 4)]) This will fail because the