Why shallow copy

So, the addresses of X and Y will be the same i. Deep copy: It makes a copy of all the members of X, allocates different memory location for Y and then assigns the copied members to Y to achieve deep copy. In this way, if X vanishes Y is still valid in the memory. The correct term to use would be cloning, where you know that they both are totally the same, but yet different i. This statement will also change name from employeeDetailsOriginal, since we have a shallow copy, or a reference to var employeeDetailsOriginal.

But, creating a brand new variable by using the properties from the original employeeDetailsOriginal variable, you can create a deep copy. Now if you change employeeDetailsDuplicate. Save my name, email, and website in this browser for the next time I comment. If you are interested in cooperation in the field of publication of articles or sponsored advertising, please contact us at contact webustry. Sign in. Forgot your password? Get help.

All rights reserved. Courses Pricing. Deep copying vs. Deep copy In the case of deep copying, a copy of all the members of A are made, memory is allocated in a different location for B, and the copied members are assigned to B. Keep Exploring. Related Courses. Learn in-demand tech skills in half the time. Early Access Courses. Assessments New. Recursive objects compound objects that, directly or indirectly, contain a reference to themselves may cause a recursive loop.

Because deep copy copies everything it may copy too much, such as data which is intended to be shared between copies. The deepcopy function avoids these problems by:. This module does not copy types like module, method, stack trace, stack frame, file, socket, window, array, or any similar types.

Shallow copies of dictionaries can be made using dict. Classes can use the same interfaces to control copying that they use to control pickling. See the description of module pickle for information on these methods. In fact, the copy module uses the registered pickle functions from the copyreg module. The former is called to implement the shallow copy operation; no additional arguments are passed.