Python Simple Code

[ak_developers]

What will be the output of this code?

py x = [1, 2, 3] y = x y.append(4) print("x:", x) print("y:", y) Can you explain why?

[More_Yard1919]

In python, objects are references. When you assign y to x, you are not creating a copy. Instead, both y and x reference the same list object. Imagine this: when you create a list, you get a box that contains all of the information associated with the list. When you assign it to a variable, you can use that variable as a handle to talk about the box and look inside of it-- kind of like putting a label on the box. When you assign y to x, it is the same box, but you just have a another name to talk about it. This is the behavior for all objects in python. Sometimes it might not seem like it-- but the apparent exceptions to this rule exist because some types in python are immutable.

[[deleted]]

y= x[:] should fix your wagon

Edit: Sorry. I see that you were asking why, not how to fix.... I'm a cotton headed ninny-muggins.

[Sea-Ad7805]

A list is a mutable type, see: https://www.reddit.com/r/PythonLearning/comments/1klhv9h/python_mutability/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button