instance

I was asked a question in an interview and i wasn't able to answer it... Here is the question How will you define an instance[c#]? My answer was it is an other name of an object ... what is the right answer for this question... Instance is to class as cake is to recipe. Any time you use a constructor to create an object, you are creating an instance. MyObject obj = new MyObject( ); I would describe instance as a single copy of an object. There might be one, there might be thousands, but an instance is a specific copy, to which you can have a reference. Class is the blueprint, instance is the

This question already has an answer here: TypeError: attack() missing 1 required positional argument: 'self' 2 answers I'm new to Python. I've written two Classes, the second one has an instance of the first one as a member variable. Now I want to call a method of Class2 via the instance of it in class one. I could not find an answer for it. Something like this: class Class1: def uselessmethod(self): pass class Class2: def __init__(self): self.c = Class1() def call_uselessmethod(self): self.c.uselessmethod() k = Class2 k.call_uselessmethod() # Error! Gives the following error: k.call

I have a C# method which creates a new instance of a class from a string, however, I get an error when running the code. obj = (ClassX)Activator.CreateInstance(Type.GetType("classPrefix_" + className)); ArgumentNullException was unhandled Value cannot be null Parameter name: type Any help on this error would be appreciated. You may need to use the assembly qualified name as the argument to Type.GetType eg AssemblyName.Namespace.ClassName MSDN Doc on assembly qualified names You may just be missing the namespace from the classname Works for me: class ClassX {} class classPrefix_x : ClassX {}

In most of the examples I have seen online while (trying to) learn classes, the instances of the classes are defined by the programmer. Are there any ways of creating an instance of a class where it the variable that stores the class is defined by the user? This is an example of an object from another SO question: class StackOverflowUser: def __init__(self, name, userid, rep): self.name = name self.userid = userid self.rep = rep dave = StackOverflowUser("Dave Webb",3171,500) How can this be changed so that the user can create instances based off of the class? jonrsharpe There are broadly two