What is the difference between the append() and extend() methods in Python?

The append() and extend() methods are used to add elements to a list in Python, but they behave differently.

The append() method adds a single item to the end of the list:

list1 = [1, 2, 3]
list1.append(4)
print(list1)

# Output:
# [1, 2, 3, 4]

The extend() method, on the other hand, adds multiple elements to the end of the list, by extending the list with another list:

list1 = [1, 2, 3]
list2 = [4, 5, 6]
list1.extend(list2)
print(list1)

# Output:
# [1, 2, 3, 4, 5, 6]

So, in summary:

• append() adds a single item to the end of the list.
• extend() adds multiple items to the end of the list, by extending the list with another list.