Deep copy vs Shallow Copy
Possible Duplicate:What is the difference between a deep copy and a shallow copy? What is the difference between deep and shallow copy. What type of a copy does a copy constructor do?
clone
How do I correctly clone a JavaScript object?
To do this for any object in JavaScript will not be simple or straightforward. You will run into the problem of erroneously picking up attributes from the object’s prototype that should be left in the prototype and not copied to the new instance. If, for instance, you are adding a clone method to Object.prototype, as some answers depict, … Read more
List changes unexpectedly after assignment. Why is this and how can I prevent it?
With new_list = my_list, you don’t actually have two lists. The assignment just copies the reference to the list, not the actual list, so both new_list and my_list refer to the same list after the assignment. To actually copy the list, you have various possibilities: You can use the builtin list.copy() method (available since Python 3.3):new_list = old_list.copy() You can slice it:new_list … Read more