append() method to add elements at the end of a Python list

append() takes exactly one argument ( not more than one ) and adds at the end of the list.

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

Output is here

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

Appending one more list

What is the difference between append() and extend() ?
Using append to add a list

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

Output is here

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

In the above code the list is added at the end of my_list. To add only the elements of another list ( 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']

Difference between Append and Insert

Using len() function we can get the total number of elements in a list. So in a zero based index system ( first element position is 0 ) we can add the element at last position by using len().
Append adds the element at the end of the list ( always) , by using insert we can add element at any given position.

Adding at the end of the list

If we add element by using insert at the end of the list , then it is same as append.

my_list=['Alex','Ronald','John']
#my_list.append('new name') # adds at the end of the list
my_list.insert(len(my_list),'new name') # adds at the end of the list
print(my_list)

Using len() to check the length of the list

my_list=['Alex','Ronald','John']
print("Length before append : ",len(my_list))
my_list.append('Ravi')
print("Length after append : ",len(my_list))
print(my_list)

Output is here

Length before append :  3
Length after append :  4
['Alex', 'Ronald', 'John', 'Ravi']

Creating a list by using data from JSON file

Here is the sample JSON file.

import json
path="D:\\my_data\\student.json" # use your sample file. 
fob=open(path,)
data=json.load(fob)
names=[]
for student in data:
    #print(student['name'])
    names.append(student['name'])
print(names)
fob.close()

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append() method to add element to list

Appending one more list

Difference between Append and Insert

Adding at the end of the list

Creating a list by using data from JSON file

Subhendu Mohapatra