tuples – Row Coding

Make names of named tuples appear in serialized JSON responses

November 29, 2023 by Tarik

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

Is it possible to unpack a tuple in Python without creating unwanted variables?

November 23, 2023 by Tarik

In Python the _ is often used as an ignored placeholder. (path, _) = self._treeView.get_cursor() You could also avoid unpacking as a tuple is indexable. def get_selected_index(self): return self._treeView.get_cursor()[0][0]

How to name tuple properties? [duplicate]

November 21, 2023 by Tarik

In C# 7.0 (Visual Studio 2017) there is a new option to do that: (string first, string middle, string last) LookupName(long id)

Two integers in Python have same id, but not lists or tuples

October 13, 2023 by Tarik

Immutable objects don’t have the same id, and as a matter of fact this is not true for any type of objects that you define separately. Generally speaking, every time you define an object in Python, you’ll create a new object with a new identity. However, for the sake of optimization (mostly) there are some … Read more

How to define operator< on an n-tuple that satisfies a strict weak ordering [duplicate]

October 12, 2023 by Tarik

strict weak ordering This is a mathematical term to define a relationship between two objects. Its definition is: Two objects x and y are equivalent if both f(x, y) and f(y, x) are false. Note that an object is always (by the irreflexivity invariant) equivalent to itself. In terms of C++ this means if you … Read more

How does Python’s comma operator work during assignment?

September 27, 2023 by Tarik

All the expressions to the right of the assignment operator are evaluated before any of the assignments are made. From the Python tutorial: First steps towards programming: The first line contains a multiple assignment: the variables a and b simultaneously get the new values 0 and 1. On the last line this is used again, … Read more

How do I create dictionary from array of tuples?

September 26, 2023 by Tarik

Swift 4 If your tuples is (Hashable, String) you can use: let array = [(“key1”, “value1”), (“key2”, “value2”), (“key3”, “value3”)] let dictionary = array.reduce(into: [:]) { $0[$1.0] = $1.1 } print(dictionary) // [“key1”: “value1”, “key2”: “value2”, “key3”: “value3”]

Differences between vector, set, and tuple

September 25, 2023 by Tarik

Vector: Ordered collection of objects of the same type. Set: Unordered collection of objects, possibly of the same type or possibly different depending on the collection type and language. Any given object can only appear once. Tuple: Ordered collection of objects of different types.