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Python | Find most common element in each column in a 2D list
• Last Updated : 24 Jun, 2019

Given a 2D list, write a Python program to find the most common element in each column of the 2D list.

Examples:

```Input : [[1, 1, 3],
[2, 3, 3],
[3, 2, 2],
[2, 1, 3]]
Output : [2, 1, 3]

Input : [['y', 'y'],
['y', 'x'],
['x', 'x']]
Output : ['y', 'x']
```

Method #1 : Using most_common() from collections module

most_common() return a list of the n most common elements and their counts from the most common to the least. Thus, we can easily find the most common elements in each column using list comprehension.

 `# Python3 program to find most common ``# element in each column in a 2D list``from` `collections ``import` `Counter`` ` `def` `mostCommon(lst):``         ` `    ``return` `[Counter(col).most_common(``1``)[``0``][``0``] ``for` `col ``in` `zip``(``*``lst)]``         ` `# Driver code``lst ``=` `[[``1``, ``1``, ``3``],``       ``[``2``, ``3``, ``3``],``       ``[``3``, ``2``, ``2``],``       ``[``2``, ``1``, ``3``]]``print``(mostCommon(lst))`
Output:
```[2, 1, 3]
```

Method #3 : Using mode() from statistics module

 `# Python3 program to find most common ``# element in each column in a 2D list``from` `scipy.stats ``import` `mode``import` `numpy as np`` ` `def` `mostCommon(lst):``     ` `    ``val, count ``=` `mode(lst, axis ``=` `0``)``    ``return` `val.ravel().tolist()``         ` `# Driver code``lst ``=` `[[``1``, ``1``, ``3``],``       ``[``2``, ``3``, ``3``],``       ``[``3``, ``2``, ``2``],``       ``[``2``, ``1``, ``3``]]``print``(mostCommon(lst))`
Output:
```[2, 1, 3]
```

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