Merge two Lists in Python (Extend, Assignment Operator) - Python Tutorial for Beginners

Published: 17 March 2021
on channel: Digital Academy

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🖥️ Merge two Lists in Python (Extend, Assignment Operator)

You may sometimes want or need to merge two Lists in Python, so that you can have all of your data located in the same variable. Or, even update its values, with new content. In that case: use the built-in extend() method, to merge the values of one list into another one.

○ Merge two Lists in Python (Extend)

It takes a list as an argument, and appends all of the elements of this list into the first list. Notice that: this method do not overwrite existing values, but add them at the end of your list.

As you can see in this example, merging the two lists in Python will result in combining all of the items inside the same list.

my_list = ['red', 'green', 'blue']
my_list.extend([1,2,3])
my_list = ['red', 'green', 'blue', 1, 2, 3]

○ Combine two Lists in Python (Assignment Operator)

Alternatively, you can use the concatenation operator (+) or the augmented assignment operator (+=) to combine 2 lists. If you need help using operators, check out our Blog and the video about: Python Operators.

my_list = ['red', 'green', 'blue']

Concatenation operator
my_list = my_list + [1,2,3]
my_list = ['red', 'green', 'blue', 1, 2, 3]

Augmented assignment operator
my_list += [1,2,3]
my_list = ['red', 'green', 'blue', 1, 2, 3]

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