# Python | Column Mean in tuple list

Sometimes, while working with records, we can have a problem in which we need to average 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(). We divide the each result with No of rows for average computation.

 `# Python3 code to demonstrate working of ` `# Column Mean in tuple list ` `# 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)) ` ` `  `# Column Mean in tuple list ` `# using list comprehension + sum() + zip() ` `res ``=` `[``sum``(ele) ``/` `len``(test_list) ``for` `ele ``in` `zip``(``*``test_list)] ` ` `  `# printing result ` `print``(``"The Cummulative column mean is : "` `+` `str``(res)) `

Output :

```The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column mean is : [2.6666666666666665, 5.0, 5.666666666666667]
```

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. We divide the each result with No of rows for average computation.

 `# Python3 code to demonstrate working of ` `# Column Mean in tuple list ` `# using zip() + map() + sum() ` ` `  `def` `avg(``list``): ` `    ``return` `sum``(``list``)``/``len``(``list``) ` `     `  `# initialize list ` `test_list ``=` `[(``1``, ``2``, ``3``), (``6``, ``7``, ``6``), (``1``, ``6``, ``8``)] ` ` `  `# printing original list ` `print``(``"The original list : "` `+` `str``(test_list)) ` ` `  `# Column Mean in tuple list ` `# using zip() + map() + sum() ` `res ``=` `list``(``map``(avg, ``zip``(``*``test_list))) ` ` `  `# printing result ` `print``(``"The Cummulative column mean is : "` `+` `str``(res)) `

Output :

```The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column mean is : [2.6666666666666665, 5.0, 5.666666666666667]
```

My Personal Notes arrow_drop_up Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.