I need a function that returns the most common values from a list. If there is more than one most common value, return all of them.
l = [1, 1, 2, 2, 4]
def most_common(l):
#some code
return common
This should return:
[1, 2]
Since they both appear twice.
I am surprised there is no simple function for this. I have tried collections but can't seem to figure this out.
You could first group items in a collections.defaultdict with counts as the values:
from collections import defaultdict
l = [1, 1, 2, 2, 4]
counts = defaultdict(int)
for number in l:
counts[number] += 1
print(counts)
# defaultdict(<class 'int'>, {1: 2, 2: 2, 4: 1})
Then you could find the most common values from this dictionary:
most_common = [k for k, v in counts.items() if v == max(counts.values())]
print(most_common)
# [1, 2]
