2列表中缺少和附加值

Question

我有两个清单：

list1 = ['1','2','3','4','5','6']
list2 = ['4','5','6','7','8']

现在我想在list2中找到缺失值和附加值。

输出应为：

Missing value = 1,2,3
Additional Value = 7,8

Answer 1

使用python sets列出差异：

set(list1).difference(list2)
set(list2).difference(list1)

结果：

>>> print 'Missing values =', ','.join(set(list1).difference(list2))
Missing values = 1,3,2
>>> print 'Additional values =', ','.join(set(list2).difference(list1))
Additional values = 7,8

如果订单很重要，那么你仍然需要使用套装：

set1, set2 = set(list1), set(list2)
[i for i in list1 if i not in set2]
[i for i in list2 if i not in set1]

结果：

>>> print 'Missing values =', ','.join([i for i in list1 if i not in set2])
Missing values = 1,2,3
>>> print 'Missing values =', ','.join([i for i in list2 if i not in set1])
Additional values = 7,8