EDIT I’ve trimmed out some of the in-progress comments here – just view the history to see. So you can make this work with 1, 2, 3 or 4 tuple generic parameters but it doesn’t work with 5. As soon as you use 5 parameters it generates code like this: public class _Page_Views_Home_Index_cshtml : System.Web.Mvc.WebViewPage<List<System.Tuple<string … Read more
def pairs(lst): i = iter(lst) first = prev = item = i.next() for item in i: yield prev, item prev = item yield item, first Works on any non-empty sequence, no indexing required.
In [469]: x = np.array([-1, 0, 1, 2]) In [470]: y = np.array([-2, -1, 0, 1]) join them into 2d array: In [471]: np.array((x,y)) Out[471]: array([[-1, 0, 1, 2], [-2, -1, 0, 1]]) transpose that array: In [472]: np.array((x,y)).T Out[472]: array([[-1, -2], [ 0, -1], [ 1, 0], [ 2, 1]]) or use the standard … Read more
Of course, by creating the tuple from your LINQ expression: public (int id, string name) GetSomeInfo() { var obj = Query<SomeType>() .Select(o => (o.Id,o.Name)) .First(); return obj; } According to another answer regarding pre-C# 7 tuples, you can use AsEnumerable() to prevent EF to mix things up. (I have not much experience with EF, but … Read more
There is a special tupled method available for every function: val bar2 = (bar _).tupled // or Function.tupled(bar _) bar2 takes a tuple of (Int, Int) (same as bar arguments). Now you can say: bar2(foo()) If your methods were actually functions (notice the val keyword) the syntax is much more pleasant: val bar = (a: … Read more
Tuples require the following to be true for the objects to be considered “equal”: Must be a Tuple object with the same number of generic parameter(s) as the current object. Each of those generic parameters must be of the same type as the other. Each member of the tuple must have the same value as … Read more
use zip if you need both >>> r=(1,’one’),(2,’two’),(3,’three’) >>> zip(*r) [(1, 2, 3), (‘one’, ‘two’, ‘three’)]
For serializing response just use any custom attribute on action and custom contract resolver (this is only solution, unfortunately, but I’m still looking for any more elegance one). Attribute: public class ReturnValueTupleAttribute : ActionFilterAttribute { public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) { var content = actionExecutedContext?.Response?.Content as ObjectContent; if (!(content?.Formatter is JsonMediaTypeFormatter)) { return; } var … Read more
No, as mentioned a Tuple<> is intended to be immutable. I use a custom Pair class if I need a mutable type that does the same thing, although in the spirit of embracing function concepts, I try not to use it. namespace StackOverflow.Helpers { public class Pair<T1, T2> { public T1 First { get; set; … Read more
Python 3.x uses __truediv__ and __floordiv__. __div__ is 2.x-only.