使用字典查找列表列表的最大值和最小值

Question

我试图在列表的列表中找到最大值和最小值。详细地说，我有这个存储推文的变量：

lines = [['ladybug7501',
  'RT SamaritansPurse: You can help the many across #PuertoRico who remain in desperate need after #HurricaneMaria. See how here: …',
  'Negative',
  -1],
 ['DyEliana',
  'RT daddy_yankee: La madre naturaleza está azotando con potencia a sus hijos. Mi corazón y mis oraciones con mi tierra #PuertoRico y mis he…',
  'Neutral',
  0],
 ['waffloesH',
  'RT SteveCase: PLEASE HELP: ChefJoseAndres is working tirelessly to feed #PuertoRico, but urgently needs our help: ',
  'Neutral',
  0],
 ['SteveLevinePR',
  'RT StarrMSS: .elvisduran gave 30K to @Bethenny to charter  plane to bring supplies to #PuertoRico HurricaneMaria. He also gave 100K to ',
  'Neutral',
  0],
 ['bronxdems',
  'RT theCEI: THANK YOU to rubendiazjr and the NY Hispanic Clergy for organizing an amazing event last week in support of PuertoRico! ❤️…',
  'Positive',
  3]]

它有更多列表，但我只发布了一个示例。为了达到这一点，我已经完成了大部分繁重的工作。我想要做的是打印出具有最高正面词和最高负面词的推文。列表最后一部分的数字越高，它就越积极。（-1、0 和 3）。我正在尝试打印出与之关联的最高价值的推文。

这是我一直在研究的一些代码：


user_lines = []
for line in lines:
    freqs  = {}
    user_lines.append(line[2])
    for i in user_lines:
        if i not in freqs:
            freqs[i] = 1
        else:
            freqs[i] += 1
        
freqs

但这就是我的全部。有人有什么想法吗？

Answer 1

如果你想只在字典中保存最差和最好的推文，你可以iterate通过推文并保存索引worst/best 评级被放置。之后，您可以将这些索引的信息保存到这样的字典中：

highest = 0
lowest = 0
dic = {}
for i, line in enumerate(lines):
    number_of_likes = line[3]
    if number_of_likes < lowest:
        lowest = i
    if number_of_likes > highest:
        highest = i

dic['lowest'] = [lines[lowest][3], lines[lowest][1]]
dic['highest'] = [lines[highest][3], lines[highest][1]]

输出：

{'lowest': [-1, 'RT SamaritansPurse: You can help the many across #PuertoRico who remain in desperate need after #HurricaneMaria. See how here: …'], 'highest': [3, 'RT theCEI: THANK YOU to rubendiazjr and the NY Hispanic Clergy for organizing an amazing event last week in support of PuertoRico! ❤️…']}

Answer 2

你可以指定max和min

的key试试

mini=min(lines, key=lambda x: x[-1])
maxi=max(lines, key=lambda x: x[-1])

print(mini)
print(maxi)

输出：

mini
['ladybug7501', 'RT SamaritansPurse: You can help the many across #PuertoRico who remain in desperate need after #HurricaneMaria. See how here: …', 'Negative', -1]

maxi
['bronxdems', 'RT theCEI: THANK YOU to rubendiazjr and the NY Hispanic Clergy for organizing an amazing event last week in support of PuertoRico! ❤️…', 'Positive', 3]

使用字典查找列表列表的最大值和最小值

Finding maximum and minimum of list of lists using dictionary

python

dictionary

list

max