In this article, you’ll learn about shallow copy and deep copy in Python with the help of examples. The idea is to iterate over the original list in the usual way and maintain two pointers to keep track of the new list: one head pointer, and one tail pointer which always points to the last node in new list These various ways of copying takes different execution time, so we can compare them on the basis of time. Python: Copy Nested List, Shallow/Deep Copy. Copying List by Reference. In Python, we use = operator to create a copy of an object. After copying if we change the copied variable data then … Clone a Linked List in C, Java and Python, Clone a Linked List: Write a function that takes a singly linked list and returns a complete copy of that list.. Whereas in deep copy, when we add an element in any of the lists, only that list is modified. Les classes peuvent utiliser les mêmes interfaces de contrôle que celles utilisées pour la sérialisation. List copy problem in python: Deep Copy. Last updated: 2019-03-23. That means: modifying one list also modifies the other. Copy an Object in Python. Having understood the concept of a shallow copy, it’s now easy to understand the concept of a deep copy. If you aren’t okay with that, check out the following section about deep copies of Python lists: Method 2: Python List Copy Deep. A shallow copy only copies the references of the list elements. Recursion is a very… You may think that this creates a new object; it doesn't. Clone a Linked List: Write a function that takes a singly linked list and returns a complete copy of that list.. If we use ‘=’ sign to store the data of the mutable object into another variable. By Xah Lee. In Python, we can find a problem with copying any mutable objects value to another. When we use “=” operator the new list refers to the same object, hence any change (append, remove, change of value) in one list is reflected on both. Deep copy of a Linked List means we do not copy the references of the nodes of the original Linked List rather for each node in the original Linked List a new node is created. It only creates a new variable that shares the reference of the original object. If you do this list_a = list_b, that'll copy a reference. # python 3 list_a = [3, 4, 5] list_b = list_a list_a  = 7 print (list_b ) # [7, 4, 5] Check Equality of 2 Objects. Les copies superficielles de dictionnaires peuvent être faites en utilisant dict.copy(), et de listes en affectant un slice de la liste, par exemple, copied_list = original_list[:]. In this article we will go through various ways of copying or cloning a list in Python. Date: 2012-03-16.