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How to Concatenate two lists in python

To concatenate two or more lists in python you can use ‘+’ operator, extend method or through iterator. Below are the few examples to concatenate lists.

Example 1: Using ‘+’ operator

list1 = [1,2,3]
list2 = [4,5,6]
#concatenating both the lists
final_list = list1 + list2

print(final_list)

Output:

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

Example 2: Using extend method

list1 = [1,2,3]
list2 = [4,5,6]
#concatenating using extend method
list1.extend(list2)

print(list1)

Output:

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

Example 3 :

list1 = [1,2,3]
list2 = [4,5,6]
#concatenating lists
list1 += list2

print(list1)

Output:

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

Each of the above examples has their own time complexity.

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