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Python program to count Bidirectional Tuple Pairs
• Last Updated : 12 Nov, 2020

Given Tuple list, compute bidirectional tuples.

Input : test_list = [(5, 6), (1, 2), (6, 5), (9, 1), (6, 5), (2, 1)]
Output : 3
Explanation : (1, 2), (2, 1); (5, 6) -> [(6, 5), (6, 5)], total 3 pairs.

Input : test_list = [(5, 6), (1, 3), (6, 5), (9, 1), (6, 5), (2, 1)]
Output : 2
Explanation : (5, 6) -> [(6, 5), (6, 5)], total 2 pairs.

Method : Using loop

In this we check for each element if we have any other element which is bidirectional, Once the pair is found, counter is incremented.

## Python3

 `# Python3 code to demonstrate working of``# Count Bidirectional Tuple Pairs``# Using loop`` ` `# initializing list``test_list ``=` `[(``5``, ``6``), (``1``, ``2``), (``6``, ``5``), (``9``, ``1``), (``6``, ``5``), (``2``, ``1``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `res ``=` `0``for` `idx ``in` `range``(``0``, ``len``(test_list)):``    ``for` `iidx ``in` `range``(idx ``+` `1``, ``len``(test_list)):`` ` `        ``# checking bidirection``        ``if` `test_list[iidx][``0``] ``=``=` `test_list[idx][``1``] ``and` `test_list[idx][``1``] ``=``=` `test_list[iidx][``0``]:``            ``res ``+``=` `1`` ` `# printing result``print``(``"Bidirectional pairs count : "` `+` `str``(res))`

Output:

The original list is : [(5, 6), (1, 2), (6, 5), (9, 1), (6, 5), (2, 1)]
Bidirectional pairs count : 3

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