Explain append and extend method with example

Sure, I'd be happy to explain the append and extend methods in Python.

1. Append Method: The append() method in Python adds a single item to the existing list. It doesn't return a new list; rather it modifies the original list.

Example:

# create a list
list1 = ['apple', 'banana', 'cherry']
print("Original List:", list1)

# append 'orange' to the list
list1.append('orange')
print("Updated List:", list1)

Output:

Original List: ['apple', 'banana', 'cherry']
Updated List: ['apple', 'banana', 'cherry', 'orange']

In this example, 'orange' is added to the end of list1.

2. Extend Method: The extend() method adds all the elements of an iterable (list, tuple, string etc.) to the end of the list. Here, the iterable is not a single element, but all the elements of iterable are added to the list.

Example:

# create two lists
list1 = ['apple', 'banana', 'cherry']
list2 = ['orange', 'grape']
print("Original List1:", list1)
print("Original List2:", list2)

# extend list1 with list2
list1.extend(list2)
print("Updated List1:", list1)

Output:

Original List1: ['apple', 'banana', 'cherry']
Original List2: ['orange', 'grape']
Updated List1: ['apple', 'banana', 'cherry', 'orange', 'grape']

In this example, all elements of list2 are added to the end of list1.