extend() method to add elements of an of an iterable to the list

extend(iterable) takes one argument.

More about iterable objects.

my_list1=['Alex','Ronald','John']
my_list2=['Ravi','Alen']
my_list1.extend(my_list2)
print(my_list1)

Output

['Alex', 'Ronald', 'John', 'Ravi', 'Alen']

Using string as iterable object

In above code we used one more list to add the elements to our main list. Here we will try with string ( string is an iterable object )

my_list1=['a','b','c','d']
str='xyz'  # string 
my_list1.extend(str) 
print(my_list1)

Output

['a', 'b', 'c', 'd', 'x', 'y', 'z']

To add only one element we will use append. To add the elements of another list ( or any iterable ) we can use extend(). This is the difference between append and extend methods.

my_list=['Alex','Ronald','John']
my_list2=['Ravi','John','Ronald']
my_list.extend(my_list2)
print(my_list)

Output is here

['Alex', 'Ronald', 'John', 'Ravi', 'John', 'Ronald']

Example 1: Extending with a Tuple

my_list = [1, 2, 3]
my_list.extend((4, 5))
print(my_list)  # Output: [1, 2, 3, 4, 5]

Example 2: Extending with a Set

my_list = [1, 2, 3]
my_set = {4, 5}
my_list.extend(my_set)
print(my_list)  # Output: [1, 2, 3, 4, 5]

Example 3: Extending an Empty List

my_list = []
my_list.extend([1, 2, 3])
print(my_list)  # Output: [1, 2, 3]

Example 4: Extending a List with a Range Object

my_list = [1, 2]
my_list.extend(range(3, 6))
print(my_list)  # Output: [1, 2, 3, 4, 5]

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extend() method to add iterable to list