List Functions

Various built-in functions are available in Python which helps to perform multiple operations on list. Below are the top must know list methods in python

Append Method

This function helps to add a new element to the given list

#Append Method
month_list = ["Jan", "Feb", "Mar", "Apr", "May"]
print("List of element before appending: ")
print(month_list)

month_list.append("Jun")
print("List of element after appending: ")
print(month_list)

Output

List of element before appending: 
['Jan', 'Feb', 'Mar', 'Apr', 'May']
List of element after appending: 
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']

Insert Method

This function helps to add a new element at specified index to the given list

#Insert Method
month_list = ["Jan", "Feb", "Apr", "May", "Jun"]
print("List of element before inserting: ")
print(month_list)

month_list.insert(2, "Mar")
print("List of element after inserting: ")
print(month_list)

Output

List of element before inserting: 
['Jan', 'Feb', 'Apr', 'May', 'Jun']
List of element after inserting: 
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']

Extend Method

This function helps to extend another new list elements to the given list elements

#Extend Method
month_list = ["Jan", "Feb", "Mar"]
month_list_new = ["Apr", "May", "Jun"]

month_list.extend(month_list_new)
print("List of element after appending: ")
print(month_list)

Output

List of element after appending: 
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']

Clear Method

This function helps to clear all the element in the given list

#Clear Method
month_list = ["Jan", "Feb", "Mar"]
print("List of element before clearance: ")
print(month_list)

month_list.clear()
print("List of element after clearance: ")
print(month_list)

Output

List of element before clearance: 
['Jan', 'Feb', 'Mar']
List of element after clearance: 
[]

Pop Method

This function helps to pop item at the specified index in the given list

#Pop Method
month_list = ["Jan", "Feb", "Mar", "Dec", "Apr", "May", "Jun"]
print("List of element before pop method: ")
print(month_list)

month_list.pop(3)
print("List of element after pop method: ")
print(month_list)

Output

List of element before pop method: 
['Jan', 'Feb', 'Mar', 'Dec', 'Apr', 'May', 'Jun']
List of element after pop method: 
['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']

Sum Function

This function returns the summation of all the values in the given list

#Sum Function
month_list = [10, 20, 30, 40, 50]
print("The sum of list is : {}".format(sum(month_list)))

Output

The sum of list is : 150

Count Method

This function returns the total occurrence of given value in the given list

#Count Function
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
print("The count of 10 in the list is : {}".format(mark_list.count(10)))

Output

The count of 10 in the list is : 3

Length Function

This function returns the total length of given list

#length Function
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
print("The length of list is : {}".format(len(mark_list)))

Output

The length of list is : 8

Index Method

This function returns the index of first occurrence for the given value

#Index Method
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
#Returns the index of first occurrence
print("The index of 60 is : {}".format(mark_list.index(60)))

Output

The index of 60 is : 5

Min Function

This function returns the minimum value of given list

#Min Function
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
#Returns the minimum element in the given list
print("The minimum element in the given list is : {}".format(min(mark_list)))

Output

The minimum element in the given list is : 10

Max Function

This function returns the maximum value of the given list

#Max Function
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
#Returns the maximum element in the given list
print("The maximum element in the given list is : {}".format(max(mark_list)))

Output

The maximum element in the given list is : 60

Sort Method

Sort Method returns the sorting order of the given list

#Sort Function
mark_list = [10, 20, 30, 10, 50, 60, 10, 60]
print("List before sorting : ")
print(mark_list)

mark_list.sort()
print("List after sorting - ascending : ")
print(mark_list)

mark_list.sort(reverse=True)
print("List after sorting - descending : ")
print(mark_list)

Output

List before sorting : 
[10, 20, 30, 10, 50, 60, 10, 60]
List after sorting - ascending : 
[10, 10, 10, 20, 30, 50, 60, 60]
List after sorting - descending : 
[60, 60, 50, 30, 20, 10, 10, 10]