Python List append(): append() Parameters, Return Value from append()

Sometimes the users want to add more items to their list. The python append function is used to add items to the end of the list. The user takes the item to be added as input from the user and adds it to the end.

For example:

Copy Code

                    
my_currencies = ['Dollar', 'Euro', 'Pound', 'Dinar', 'Riyal', 'Rupees']

# append the new item to the end of the currencies list

my_currencies.append('Yen')

print(my_currencies)

Output: 

['Dollar', 'Euro', 'Pound', 'Dinar', 'Riyal', 'Rupees', 'Yen']

Syntax:

list.append(item)

append() Parameters

The append() takes a single parameter as input from the user.

item- this is the item that the user wants to be added at the end of the list.

Return Value from append()

The python append does not return any value to the user. It adds the item to the list and updates it.

Let us look at some more examples:

Example 1: Adding Element to a List

In the example given below, we are adding a new item to be appended to the end of the list.

Source Code:

Copy Code

                    
my_animals = ['cat', 'dog', 'rabbit', 'frog', 'birds']

# Add 'horse' to the list

my_animals.append('horse')

print('Updated list of animals: ', my_animals)

Output

Updated list of animals: ['cat', 'dog', 'rabbit', 'frog', 'birds', 'horse']

Example 2: Adding List to a List

In python, users can also append a list to another list. Look at the program given below:

Source Code:

Copy Code

                    
animals = ['cat', 'dog', 'rabbit', 'frog', 'birds' ]



# list of wild animals

wild_ani = ['tiger', 'fox', 'lion']



# appending the wild_ani list



animals.append(wild_ani)




print('Updated list of animals: ', animals)

Output

Updated list of animals: ['cat', 'dog', 'rabbit', 'frog', 'birds', ['tiger', 'fox', 'lion']]

How do you append to a list in Python?

The append() in python allows users to append items to their list.

For example:

Copy Code

                    
my_list = ['Live', 'A', 'Good']

my_list.append('Life')

print my_list

Output:

['Live', 'A', 'Good', 'Life']

How do you append to a list?

Users can append a list in python using the in-built append(). This method adds the elements to the end of the list and updates it.

How do you append to a file in python?

To append a file in Python, you use can use ‘a’ access mode. This opens the file for writing. The data will be added to the end.

For example:

Copy Code

                    
f1 = open("myfile.txt", "w")

L = ["This is Delhi \n", "This is Paris \n", "This is London"]

f1.writelines(L)

f1.close()

   

# Append-adds at last

f1 = open("myfile.txt", "a") # append mode

f1.write("Today \n")

f1.close()

   

f1 = open("myfile.txt", "r")

print("Output of Headlines after appending")

print(f1.read())

print()

f1.close()

   

# Write-Overwrites

f1 = open("myfile.txt", "w") # write mode

f1.write("Tomorrow \n")

f1.close()

   

f1 = open("myfile.txt", "r")

print("Output of Headlines after writing")

print(f1.read())

print()

f1.close()

Output:

The output of Headlines after appending

This is Delhi

This is Paris

This is London 

today



The output of Headlines after writing

Tomorrow

How do you append in Python 3?

To append an item to the end of the list in python 3 we use the append().

For example:

Copy Code

                    
langs = ['C++', 'Java', 'Python']

langs.append('C#')

print ("updated langs list : ", langs)



Output:


updated langs list : ['C++', 'Java', 'Python', 'C#']

Share with friends