Q:

How to append element in the list

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robaa
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2022-11-07
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Python provides built-in methods to append or add elements to the list. We can also append a list into another list. These methods are given below.

  • append(elmt) - It appends the value at the end of the list.
  • insert(index, elmt) - It inserts the value at the specified index position.
  • extends(iterable) - It extends the list by adding the iterable object.
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robaa
2022-11-07
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1. append(elmt)

This function is used to add the element at the end of the list. The example is given below.

Example -

names = ["Joseph", "Peter", "Cook", "Tim"]  
  
print('Current names List is:', names)  
  
new_name = input("Please enter a name:\n")  
names.append(new_name)  # Using the append() function  
  
print('Updated name List is:', names)

 

Output:

Current names List is: ['Joseph', 'Peter', 'Cook', 'Tim']
Please enter a name:
Devansh
Updated name List is: ['Joseph', 'Peter', 'Cook', 'Tim', 'Devansh']

 

2. insert(index, elmt)

The insert() function adds the elements at the given an index position. It is beneficial when we want to insert element at a specific position. The example is given below.

 

Example -

list1 = [10, 20, 30, 40, 50]  
  
print('Current Numbers List: ', list1)  
  
el = list1.insert(3, 77)  
print("The new list is: ",list1)  
  
n = int(input("enter a number to add to list:\n"))  
  
index = int(input('enter the index to add the number:\n'))  
  
list1.insert(index, n)  
  
print('Updated Numbers List:', list1)

 

Output:

Current Numbers List:  [10, 20, 30, 40, 50]
The new list is:  [10, 20, 30, 77, 40, 50]
enter a number to add to list:
 45
enter the index to add the number:
1
Updated Numbers List: [10, 45, 20, 30, 77, 40, 50]

 

3. extend(iterable)

The extends() function is used to add the iterable elements to the list. It accepts iterable object as an argument. Below is the example of adding iterable element.

 

Example -

list1 = [10,20,30]  
list1.extend(["52.10", "43.12" ])  # extending list elements  
print(list1)  
list1.extend((40, 30))  # extending tuple elements  
print(list1)  
list1.extend("Apple")  # extending string elements  
print(list1)

 

Output:

[10, 20, 30, '52.10', '43.12']
[10, 20, 30, '52.10', '43.12', 40, 30]
[10, 20, 30, '52.10', '43.12', 40, 30, 'A', 'p', 'p', 'l', 'e']

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