counter python most common code example

Example 1: 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)

Example 2: python counter

>>> # Tally occurrences of words in a list
>>> cnt = Counter()
>>> for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
...     cnt[word] += 1
>>> cnt
Counter({'blue': 3, 'red': 2, 'green': 1})

>>> # Find the ten most common words in Hamlet
>>> import re
>>> words = re.findall(r'\w+', open('hamlet.txt').read().lower())
>>> Counter(words).most_common(10)
[('the', 1143), ('and', 966), ('to', 762), ('of', 669), ('i', 631),
 ('you', 554),  ('a', 546), ('my', 514), ('hamlet', 471), ('in', 451)]

Example 3: python counting dictionary

counts = dict()
for i in items:
  counts[i] = counts.get(i, 0) + 1

Example 4: 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)]