10 most occuring element in a list-python

Question

Consider a list with 100 elements. I want to write a code to print 10 most occuring element.

import itertools
import operator

def most_common(lst):
    return max(set(lst), key=lst.count)

THis is giving me the 1st most occuring element. I want 10 most occuring.

[`collections.Counter`](https://docs.python.org/3/library/collections.html#collections.Counter) — khelwood, Mar 20 '21 at 22:35
https://stackoverflow.com/questions/1518522/find-the-most-common-element-in-a-list — NotAnAmbiTurner, Mar 20 '21 at 22:38
this is a list of IP addreses and i want to return 10 most occurning IP addreses — Joe, Mar 20 '21 at 22:40
As an aside, `max(set(lst), key=lst.count)` is an inefficient algorithm — juanpa.arrivillaga, Mar 20 '21 at 23:28

Pavlos Rousoglou · Answer 1 · 2021-03-20T22:46:57.553

2

For calculating frequencies of hashable objects, Counter is great in python:

from collections import Counter

my_list = ['a','b','c','a','a','b','c','a','a','a','a','a','a','a','a','b','c','b','c','b','c','d','d','d','d','d']

freqs= Counter(my_list)
print(freqs.most_common(3))

Output

[('a', 11), ('b', 5), ('c', 5)]

In your case, you would substitute 3 in the parameters of most_common() function with the desired number of elements, which is 10.

edited Mar 20 '21 at 22:46

answered Mar 20 '21 at 22:40

Pavlos Rousoglou

185
1
9

This only works for hashable objects. – NotAnAmbiTurner Mar 20 '21 at 22:41
3

@NotAnAmbiTurner OPs too, it uses `set` – Francisco Mar 20 '21 at 22:43
In this case, IP addresses are strings which are hashable – Pavlos Rousoglou Mar 20 '21 at 22:43

10 most occuring element in a list-python

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