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Python – Summation in Dual element Records List
• Last Updated : 06 Mar, 2020

Sometimes, while working with Records list, we can have problem in which we perform the summation of dual tuple records and store it in list. This kind of application can occur over various domains. Lets discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension
This is one of the way to solve this problem. In this we perform summation of dual tuples in a list and iteration is performed inside comprehended list.

 `# Python3 code to demonstrate ``# Summation in Dual element Records List``# using list comprehension`` ` `# Initializing list``test_list ``=` `[(``6``, ``7``), (``2``, ``4``), (``8``, ``9``), (``6``, ``2``)]`` ` `# printing original lists``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Summation in Dual element Records List``# using list comprehension``res ``=` `[ele[``0``] ``+` `ele[``1``] ``for` `ele ``in` `test_list]`` ` `# printing result ``print` `(``"Summation pairs in tuple list : "` `+` `str``(res))`
Output :
```The original list is : [(6, 7), (2, 4), (8, 9), (6, 2)]
Summation pairs in tuple list : [13, 6, 17, 8]
```

Method #2 : Using `reduce() + add()`
This is yet another way to perform this task. In this, we iterate through the list and perform summation using reduce() and add() respectively.

 `# Python3 code to demonstrate ``# Summation in Dual element Records List``# using reduce() + add()``from` `operator ``import` `add``from` `functools ``import` `reduce`` ` `# Initializing list``test_list ``=` `[(``6``, ``7``), (``2``, ``4``), (``8``, ``9``), (``6``, ``2``)]`` ` `# printing original lists``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Summation in Dual element Records List``# using reduce() + add()``res ``=` `[``reduce``(add, sub, ``0``) ``for` `sub ``in` `test_list]`` ` `# printing result ``print` `(``"Summation pairs in tuple list : "` `+` `str``(res))`
Output :
```The original list is : [(6, 7), (2, 4), (8, 9), (6, 2)]
Summation pairs in tuple list : [13, 6, 17, 8]
```

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