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How to Append Multiple Items to List at Once in Python

In Python 3, the append() function adds a single item to an existing list. The append() method can only add one item at a time. If you want to add multiple elements at once, you’ll want to use the extend() method.

The syntax for the extend() method is given as follows:

list.extend([list])

The extend method takes a list of items as its argument and then adds each of its items to an existing list as a separate item.

The following code shows how the extend method works:

countries = ['Argentina', 'Bahamas', 'Canada']

print(countries)

countries.extend(['Denmark', 'Ireland', 'Luxembourg'])

print(countries)

In this example, we have a list called countries which contain three countries. Using the extend method, we added three new countries at once to the list.

Since the extend() function in Python accepts a list as its sole argument, we can pass another list to the extend function, as shown in the following example:

sequence1 = [1, 2, 3, 4]
sequence2 = [5, 6, 7, 8]

sequence1.extend(sequence2)

print(sequence1)

Note that the extend function adds each new item to the end of the list.