# Python – Row-wise element Addition in Tuple Matrix

• Difficulty Level : Medium
• Last Updated : 30 Dec, 2020

Sometimes, while working with Python tuples, we can have a problem in which we need to perform Row-wise custom elements addition in Tuple matrix. This kind of problem can have application in data domains. Let’s discuss certain ways in which this task can be performed.

Input :
test_list = [[(‘Gfg’, 3)], [(‘best’, 1)]]
cus_eles = [1, 2]
Output : [[(‘Gfg’, 3, 1)], [(‘best’, 1, 2)]]

Input :
test_list = [[(‘Gfg’, 6), (‘Gfg’, 3)]]
cus_eles = 
Output : [[(‘Gfg’, 6, 7), (‘Gfg’, 3, 7)]]

Method #1 : Using `enumerate()` + nested list comprehension
The combination of above methods can be used to solve this problem. In this, we perform the task of adding elements using nested list comprehension and index iteration by enumerate().

 `# Python3 code to demonstrate working of ``# Row-wise element Addition in Tuple Matrix``# Using enumerate() + list comprehension`` ` `# initializing list``test_list ``=` `[[(``'Gfg'``, ``3``), (``'is'``, ``3``)], [(``'best'``, ``1``)], [(``'for'``, ``5``), (``'geeks'``, ``1``)]]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing Custom eles``cus_eles ``=` `[``6``, ``7``, ``8``]`` ` `# Row-wise element Addition in Tuple Matrix``# Using enumerate() + list comprehension``res ``=` `[[sub ``+` `(cus_eles[idx], ) ``for` `sub ``in` `val] ``for` `idx, val ``in` `enumerate``(test_list)]`` ` `# printing result ``print``(``"The matrix after row elements addition : "` `+` `str``(res)) `

Output :

The original list is : [[(‘Gfg’, 3), (‘is’, 3)], [(‘best’, 1)], [(‘for’, 5), (‘geeks’, 1)]]
The matrix after row elements addition : [[(‘Gfg’, 3, 6), (‘is’, 3, 6)], [(‘best’, 1, 7)], [(‘for’, 5, 8), (‘geeks’, 1, 8)]]

Method #2 : Using `zip()` + list comprehension
The combination of above functions can be used to solve this problem. In this, we perform the task of combining new row elements with respective rows using zip(), rather than enumerate().

 `# Python3 code to demonstrate working of ``# Row-wise element Addition in Tuple Matrix``# Using zip() + list comprehension`` ` `# initializing list``test_list ``=` `[[(``'Gfg'``, ``3``), (``'is'``, ``3``)], [(``'best'``, ``1``)], [(``'for'``, ``5``), (``'geeks'``, ``1``)]]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing Custom eles``cus_eles ``=` `[``6``, ``7``, ``8``]`` ` `# Row-wise element Addition in Tuple Matrix``# Using zip() + list comprehension``res ``=` `[[(idx, val) ``for` `idx ``in` `key] ``for` `key,  val ``in` `zip``(test_list, cus_eles)]`` ` `# printing result ``print``(``"The matrix after row elements addition : "` `+` `str``(res)) `

Output :

The original list is : [[(‘Gfg’, 3), (‘is’, 3)], [(‘best’, 1)], [(‘for’, 5), (‘geeks’, 1)]]
The matrix after row elements addition : [[(‘Gfg’, 3, 6), (‘is’, 3, 6)], [(‘best’, 1, 7)], [(‘for’, 5, 8), (‘geeks’, 1, 8)]]

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