# Python | Cummulative Columns summation of Records

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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