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Python | Indices of Kth element value
• Last Updated : 03 Nov, 2019

Sometimes, while working with records, we might have a problem in which we need to find all the indices of elements for a particular value at a particular Kth position of tuple. This seems to be a peculiar problem but while working with many keys in records, we encounter this problem. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using loop

This is the brute force method by which this problem can be solved. In this, we keep a counter for indices and append to list if we find the specific record at Kth position in tuple.

 `# Python3 code to demonstrate working of``# Indices of Kth element value``# Using loop`` ` `# initialize list ``test_list ``=` `[(``3``, ``1``, ``5``), (``1``, ``3``, ``6``), (``2``, ``5``, ``7``),``                        ``(``5``, ``2``, ``8``), (``6``, ``3``, ``0``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initialize ele ``ele ``=` `3`` ` `# initialize K ``K ``=` `1` ` ` `# Indices of Kth element value``# Using loop``# using y for K = 1 ``res ``=` `[]``count ``=` `0``for` `x, y, z ``in` `test_list:``    ``if` `y ``=``=` `ele:``        ``res.append(count)``    ``count ``=` `count ``+` `1`` ` `# printing result``print``(``"The indices of element at Kth position : "` `+` `str``(res))`
Output :

The original list is : [(3, 1, 5), (1, 3, 6), (2, 5, 7), (5, 2, 8), (6, 3, 0)]
The indices of element at Kth position : [1, 4]

Method #2 : Using `enumerate()` + list comprehension

The combination of above functions can be used to solve this problem. In this, we enumerate for the indices using `enumerate()`, rest is performed as in above method but in a compact way.

 `# Python3 code to demonstrate working of``# Indices of Kth element value``# Using enumerate() + list comprehension`` ` `# initialize list ``test_list ``=` `[(``3``, ``1``, ``5``), (``1``, ``3``, ``6``), (``2``, ``5``, ``7``), ``                        ``(``5``, ``2``, ``8``), (``6``, ``3``, ``0``)]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initialize ele ``ele ``=` `3`` ` `# initialize K ``K ``=` `1` ` ` `# Indices of Kth element value``# Using enumerate() + list comprehension``res ``=` `[a ``for` `a, b ``in` `enumerate``(test_list) ``if` `b[K] ``=``=` `ele]`` ` `# printing result``print``(``"The indices of element at Kth position : "` `+` `str``(res))`
Output :

The original list is : [(3, 1, 5), (1, 3, 6), (2, 5, 7), (5, 2, 8), (6, 3, 0)]
The indices of element at Kth position : [1, 4]

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