Python – Count frequency of sublist in given list

PythonServer Side ProgrammingProgramming

When it is required to count the frequency of a sub-list in a given list, a list comprehension and the ‘len’ method along with the ‘if’ condition are used.

Example

Below is a demonstration of the same −

my_list = [23, 33, 45, 67, 54 , 43, 33, 45, 67, 83, 33, 45, 67,90, 0]

print("The list is : " )
print(my_list)

sub_list = [33, 45, 67, 90]
print("The sub-list is : " )
print(sub_list)

my_result = len([sub_list for index in range(len(my_list)) if my_list[index : index + len(sub_list)] == sub_list])

print("The resultant list is : ")
print(my_result)

Output

The list is :
[23, 33, 45, 67, 54, 43, 33, 45, 67, 83, 33, 45, 67, 90, 0]
The sub-list is :
[33, 45, 67, 90]
The resultant list is :
1

Explanation

  • A list of integers is defined and is displayed on the console.

  • The sub-list is defined and is displayed on the console.

  • A list comprehension is used to iterate over the list, and use an ‘if’ condition.

  • This condition checks if the sum of the length of the sub-list and the specific index and the sublist are equal.

  • If yes, they are appended to a list, and assigned to a variable.

  • This is displayed as output on the console.

raja
Published on 13-Sep-2021 11:01:44
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