在列表列表中查找最常出现的配对

结合使用

collections.Counter

itertools.combinations

from collections import Counterfrom itertools import combinationsd  = Counter()for sub in a:    if len(a) < 2:        continue    sub.sort()    for comb in combinations(sub,2):        d[comb] += 1print(d.most_common())[(('Jennifer', 'John'), 3), (('John', 'Mark'), 2), (('Jennifer', 'Mark'), 2), (('Anna', 'John'), 1), (('Joe', 'Mark'), 1), (('Anna', 'Jennifer'), 1)]

most_common()

n

n

d.most_common(n)