How Can I Concatenate Lists in Python?

Concatenating Lists in Python

The need to combine lists is prevalent in various programming scenarios. Python offers several methods for achieving this concatenation task.

Using the Plus ( ) Operator

The most straightforward approach is to use the operator. By placing two lists next to each other separated by a , you can create a new list containing all the elements from both input lists.

Example:

listone = [1, 2, 3]
listtwo = [4, 5, 6]
joinedlist = listone + listtwo

Output:

>>> joinedlist
[1, 2, 3, 4, 5, 6]

Using the extend() Method

Another convenient method is extend(). It appends the elements of one list to the end of another.

Example:

listone.extend(listtwo)

This modification updates the original listone to become the concatenated list.

Understanding Copying Behavior

It's important to note that both methods create a new list containing references to the elements in the original lists. Any changes made to the individual elements will be reflected in both concatenated lists. However, any alterations to the original lists themselves will not affect the concatenated list.

To achieve a deep copy, where changes to the original lists do not affect the concatenated list, use the copy.deepcopy() function.

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