What are List Operations in Python | EP-18 List Operations in Python | List Methods In Python

Adding Elements to a Python List

Method 1: Using append() method
Elements can be added to the List by using the built-in append() function. Only one element at a time can be added to the list by using the append() method, for the addition of multiple elements with the append() method, loops are used. Tuples can also be added to the list with the use of the append method because tuples are immutable. Unlike Sets, Lists can also be added to the existing list with the use of the append() method.

# Python program to demonstrate
# Addition of elements in a List

# Creating a List
List = []
print(List)

# Addition of Elements
# in the List
print(List)

# Adding elements to the List
# using Iterator
for i in range(1, 11):
print(List)

# Adding Tuples to the List
print(List)

# Addition of List to a List
List2 = [ 'cybrosys']
print(List)
Method 2: Using insert() method

append() method only works for the addition of elements at the end of the List, for the addition of elements at the desired position, insert() method is used.  append() which takes only one argument, the insert() method requires two arguments(position, value). 

Python

# Python program to demonstrate 

# Addition of elements in a List # Creating a List

List = [1,2,3,4]

print(List)

# Addition of Element at 

# specific Position

# (using Insert Method)

print(List)

Method 3: Using extend() method

Other than append() and insert() methods, there’s one more method for the Addition of elements, extend(), this method is used to add multiple elements at the same time at the end of the list.

Python

# Python program to demonstrate

# Addition of elements in a List

 # Creating a List

 List = [1, 2, 3, 4]

print(List)

# Addition of multiple elements

# to the List at the end

# (using Extend Method)

print(List)

Method 1:  A list can be reversed by using the reverse() method in Python.

Python

# Reversing a list

mylist = [1, 2, 3, 4, 5, 'cybrosys', 'Python']

print(mylist)

Method 2: Using the reversed() function:

The reversed() function returns a reverse iterator, which can be converted to a list using the list() function.

Python

my_list = [1, 2, 3, 4, 5,6,7,8,9,10]

reversed_list = list(reversed(my_list))

print(reversed_list)

Removing Elements from the List

Method 1: Using remove() method
Elements can be removed from the List by using the built-in remove() function but an Error arises if the element doesn’t exist in the list. Remove() method only removes one element at a time, to remove a range of elements, the iterator is used. The remove() method removes the specified item.

# Python program to demonstrate
# Removal of elements in a List

# Creating a List
List = [1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12]
print(List)

# Removing elements from List
# using Remove() method
print(List)

# Creating a List
List = [1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12]
# Removing elements from List
# using iterator method
for i in range(1, 8​):
print(List)
Method 2: Using pop() method

pop() function can also be used to remove and return an element from the list, but by default it removes only the last element of the list, to remove an element from a specific position of the List, the index of the element is passed as an argument to the pop() method.

Python

List = [1, 2, 3, 4, 5]

# Removing element from the

# Set using the pop() method

 print(List)

# Removing element at a

# specific location from the

# Set using the pop() method

print("\nList after popping a specific element: ")

 print(List)

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