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Python | Cummulative Columns summation of Records
• Last Updated : 03 Nov, 2019

Sometimes, while working with records, we can have a problem in which we need to sum all the columns of a container of lists which are tuples. This kind of application is common in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using `sum()` + list comprehension + `zip()`
This task can be performed using combination of above functions. In this, we cummulate the like index elements, i.e columns using `zip()`, and then iterate through them using list comprehension and perform summation using `sum()`.

 `# Python3 code to demonstrate working of``# Cummulative Columns summation of Records``# using list comprehension + sum() + zip()`` ` `# initialize list``test_list ``=` `[(``1``, ``2``, ``3``), (``6``, ``7``, ``6``), (``1``, ``6``, ``8``)]`` ` `# printing original list``print``(``"The original list : "` `+` `str``(test_list))`` ` `# Cummulative Columns summation of Records``# using list comprehension + sum() + zip()``res ``=`  `[``sum``(ele) ``for` `ele ``in` `zip``(``*``test_list)]`` ` `# printing result``print``(``"The Cummulative column sum is : "` `+` `str``(res))`
Output :
```The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column sum is : [8, 15, 17]
```

Method #2 : Using `zip() + map() + sum()`
This method is similar to the above method. In this, the task performed by list comprehension is performed by `map()`, which extends the summation of columns to zipped elements.

 `# Python3 code to demonstrate working of``# Cummulative Columns summation of Records``# using zip() + map() + sum()`` ` `# initialize list``test_list ``=` `[(``1``, ``2``, ``3``), (``6``, ``7``, ``6``), (``1``, ``6``, ``8``)]`` ` `# printing original list``print``(``"The original list : "` `+` `str``(test_list))`` ` `# Cummulative Columns summation of Records``# using zip() + map() + sum()``res ``=` `list``(``map``(``sum``, ``zip``(``*``test_list)))`` ` `# printing result``print``(``"The Cummulative column sum is : "` `+` `str``(res))`
Output :
```The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column sum is : [8, 15, 17]
```

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