If I have an object that compares equal to an element of a Python set, but is not the same object, is there a reasonable way to get a reference to the object in the set? The use case would be using...

When the p function is used to print out an object, it may give an ID, and it is different from what object_id() gives. What is the reason for the different numbers? Update: 0x4684abc is different...

t = (1,2,3) t1 = (1,2,3) print(id(t)) print(id(t1)) The above lines of code gives the same addresses in script mode in Python, but in interactive mode it outputs different addresses. Can anyone e...

I've started learning Python (python 3.3) and I was trying out the is operator. I tried this: >>> b = 'is it the space?' >>> a = 'is it the space?' >>> a is b False >...

I want to build a hashmap where they keys are references. I want that equality for those references means reference equality, i.e. both references borrow the same object. use std::collections::hash...

I have an numpy array(arr) of size (3997,29). I am using this array to create a dataset. This array has both integer and float variables. So dtype is reference. But when I execute it I get the belo...

I've playing around with C++20's [[no_unique_address]] attribute and found some interesting behavior when using it with the has_unique_object_representations type trait: #include <type_traits&gt...

I'm playing around with [[no_unique_address]] in c++20. In the example on cppreference we have an empty type Empty and type Z struct Empty {}; // empty class struct Z { char c; [[no_unique_add...

>>> import sys >>> sys.version '2.7.3 (default, Mar 13 2014, 11:03:55) \n[GCC 4.7.2]' >>> import os >>> os.remove is os.unlink False >>> os.remove == os...

The following makes sense to me: >>> [] is [] False Given that lists are mutable, I would expect [] to be a new empty list object every time it appears in an expression. Using this expl...

Dart has both: an equality operator == and a top-level function named identical(). By the choice of syntax, it feels natural to want to use Dart's == operator more frequently than identical(),...

my code is below : NSURL *urlID = [objID URIRepresentation]; NSString *strID = [urlID absoluteString]; NSDictionary *infoDict = [NSDictionary dictionaryWithObjectsAndKeys:strID, @"objectID", nil...

I've noticed that objects have their IDs assigned in a counterintuitive fashion. The earlier an object is created, the greater its object ID. I would have thought they would have been assigned in a...

ORIGINAL QUESTION: (My question applies to Python 3.2+, but I doubt this has changed since Python 2.7.) Suppose I use an expression that we usually expect to create an object. Examples: [1,2,3]; ...

I retrieve a list of ObjectId and I want to retrieve all object in my mongo database using the parameter $all I'm using pymongo and my request look like this : db.database.collection.find({ "_id"...

I'm trying out the usage of OBJECT_ID and found the following entry in MSDN: "Returns the database object identification number of a schema-scoped object." What is database object identificati...

I've often heard that these methods (Object.hashCode and System.identityHashCode) return the address of the object, or something computed quickly from the address; but I'm also pretty sure the garb...