Insert an item at end of a Python list

This post will discuss how to insert an item at the end of a list in Python.

1. Using `list.append(x)` function

You can add new items at the end of the list by using the append() function:

if __name__ == '__main__':

l = ['A', 'B', 'C']

x = 'D'

l.append(x)

print(l) # prints ['A', 'B', 'C', 'D']

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2. Using `list.insert(i, x)` function

You can also use the list’s insert() function that inserts an item at the specified position.

if __name__ == '__main__':

l = ['A', 'B', 'C']

x = 'D'

l.insert(len(l), x)

print(l) # prints ['A', 'B', 'C', 'D']

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3. Using Iterable Unpacking Operator

Another plausible way of insertion at the end is using the * iterable unpacking operator. This feature was introduced with Python 3.5 by the acceptance of PEP 448 – Additional Unpacking Generalizations.

if __name__ == '__main__':

l = ['A', 'B', 'C']

x = 'D'

l = [*l, x]

print(l) # prints ['A', 'B', 'C', 'D']

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4. Creating a new list

Another approach is to convert the given item into a list first and then concatenate it to the existing list. Note that this solution is slower than all the above solutions since it creates a new list.

if __name__ == '__main__':

l = ['A', 'B', 'C']

x = 'D'

l += [x] # or use slicing: l[len(l):] = [x]

print(l) # prints ['A', 'B', 'C', 'D']

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That’s all about inserting an item at the end of a list in Python.

Insert an item at end of a Python list

1. Using list.append(x) function

2. Using list.insert(i, x) function

3. Using Iterable Unpacking Operator

4. Creating a new list

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1. Using `list.append(x)` function

2. Using `list.insert(i, x)` function