Add elements to the list in python

Add Item to a List

append() method is used to add an Item to a List.

list=[1,2]
print('list before append', list)

list.append(3)

print('list after append', list)

Output

list before append [1, 2]
list after append [1, 2, 3]

Add Item Using extend() Function

NOTE :- extend() method can be used to add multiple item at a time in list.

list=[1,2]
print('list before extend', list)

list.extend([3,4])

print('list after extend', list)

Output

list before extend [1, 2]
list after extend [1, 2, 3, 4]

append() list Items using for loop

Python provides append() function which is used to add an element to the list. However, the append() function can only add value to the end of the list. Consider the following example in which, we are taking the elements of the list from the user and printing the list on the console.

 
#Declaring the empty list  
l =[]  

#Number of elements will be entered by the user    
n = int(input("Enter the number of elements in the list:"))  

# for loop to take the input  
for i in range(0,n):     
    # The input is taken from the user and added to the list as the item  
    l.append(input("Enter the item:"))     
print("printing the list items..")   

# traversal loop to print the list items    
for i in l:   
    print(i, end = "  ")     
 

Output

Enter the number of elements in the list:5
Enter the item:25
Enter the item:46
Enter the item:12
Enter the item:75
Enter the item:42
printing the list items
25  46  12  75  42  

insert() function

The insert() function adds the element passed to the index value and increase the size of the list too.

my_list = [1, 2, 3]
print(my_list)
my_list.insert(1, ‘Sunny') #add element at 1
print(my_list) 

Output

[1, 2, 3]
[1, ‘Sunny’, 2, 3, 4, 5]

Add Two Lists

list = [1,2]
list2 = [3,4]
list3 = list + list2
print(list3)

Output

[1, 2, 3, 4]

Example: Write the program to remove the duplicate element of the list.

list1 = [1,2,2,3,55,98,65,65,13,29]  

# Declare an empty list that will store unique values  
list2 = []  
for i in list1:  
    if i not in list2:  
        list2.append(i)  

print(list2)  

Output

[1, 2, 3, 55, 98, 65, 13, 29]