python计数元组列表的一个字段中的三重复数

发布时间：2020-12-20 11:45:08 所属栏目：Python 来源：网络整理

导读：我有名单,名字和姓氏列表. 如何获得大于3的姓氏数. import collectionsnames = [['Fiona','Murray'],['Diane','Springer'],['Dylan','Oliver'],['Alison','McDonald'],['Sophie','Peters'],['Kevin','Davidson'],['David','Marshall'],['Jake','Lewis'],['Th

我有名单,名字和姓氏列表.

如何获得大于3的姓氏数.

import collections

names = [['Fiona','Murray'],['Diane','Springer'],['Dylan','Oliver'],['Alison','McDonald'],['Sophie','Peters'],['Kevin','Davidson'],['David','Marshall'],['Jake','Lewis'],['Thomas','Burgess'],['Fiona','Oliver'] ]

lst1 = [(a,b) for (a,b) in collections.Counter(map(tuple,names)).iteritems()]

我尝试了列表理解但无法获得大于3的姓氏.

解决方法

更具功能性的编程方法.

from collections import Counter
from operator import itemgetter
from itertools import imap

[(name,count) for name,count in Counter(imap(itemgetter(1),names)).iteritems() if count > 3]

（编辑：李大同）

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