Python counter least common

from collections import Counter
data_list = [1,1,2,2,2,2,3,3,3,3,3,3,3,4,4,4,4,4,4,4]
least_common = Counter(data_list).most_common()[-1]
print(least_common)
# The number 1 appears 2 times
(1, 2)

Python counter least common

import collections
c = collections.Counter(a=1, b=2, c=3)
n = 2

print c.most_common()[:-n-1:-1]Output[('a', 1), ('b', 2)]

Source: kite.com

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