# Python – Extract range of Consecutive Similar elements ranges from string list

• Last Updated : 01 Oct, 2020

Given a list, extract range of consecutive similar elements.

Input : test_list = [2, 3, 3, 3, 8, 8]
Output : [(2, 0, 0), (3, 1, 3), (8, 4, 5)]
Explanation : 2 occurs from 0th to 0th index, 3 from 1st to 3rd index.

Input : test_list = [3, 3, 3]
Output : [(3, 0, 3)]
Explanation : 3 from 0th to 3rd index.

Approach: Using loop

This is a brute way to tackle this problem. In this, we loop for each element and get a similar element range. These are traced and appended in list accordingly with elements.

## Python3

 `# Python3 code to demonstrate working of ``# Consecutive Similar elements ranges``# Using loop`` ` `# initializing list``test_list ``=` `[``2``, ``3``, ``3``, ``3``, ``8``, ``8``, ``6``, ``7``, ``7``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `res ``=` `[]``idx ``=` `0``while` `idx < (``len``(test_list)):``    ``strt_pos ``=` `idx``    ``val ``=` `test_list[idx]``     ` `    ``# getting last pos.``    ``while` `(idx < ``len``(test_list) ``and` `test_list[idx] ``=``=` `val): ``        ``idx ``+``=` `1``    ``end_pos ``=` `idx ``-` `1``     ` `    ``# appending in format [ele, strt_pos, end_pos]``    ``res.append((val, strt_pos, end_pos))`` ` `# printing result ``print``(``"Elements with range : "` `+` `str``(res))`

Output:

The original list is : [2, 3, 3, 3, 8, 8, 6, 7, 7]
Elements with range : [(2, 0, 0), (3, 1, 3), (8, 4, 5), (6, 6, 6), (7, 7, 8)]

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