与 python 中的 set.intersection 相反？
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Opposite of set.intersection in python?
提问by user4847061
In Python you can use a.intersection(b)to find the items common to both sets.
在 Python 中，您可以使用a.intersection(b)查找两个集合共有的项目。
Is there a way to do the disjointopposite version of this? Items that are not common to both aand b; the unique items in aunioned with the unique items in b?
有没有办法做这个不相交的相反版本？a和不共同的项目b；中的独特物品a与b?
采纳答案by Martijn Pieters
You are looking for the symmetric difference; all elements that appear only in set a or in set b, but not both:
您正在寻找对称差异；只出现在集合 a 或集合 b 中的所有元素，但不能同时出现：
a.symmetric_difference(b)
From the set.symmetric_difference()method documentation:
从set.symmetric_difference()方法文档：
Return a new set with elements in either the set or otherbut not both.
返回一个新集合，其中包含集合中的元素或其他元素，但不能同时包含两者。
You can use the ^operator too, if both aand bare sets:
^如果a和b都设置，您也可以使用运算符：
a ^ b
while set.symmetric_difference()takes any iterable for the otherargument.
whileset.symmetric_difference()为另一个参数接受任何迭代。
The output is the equivalent of (a | b) - (a & b), the union of both sets minus the intersection of both sets.
输出等价于(a | b) - (a & b)，两个集合的并集减去两个集合的交集。
回答by Muhammad Ammar Fauzan
Try this code for (set(a) - intersection(a&b))
试试这个代码 (set(a) -intersection(a&b))
a = [1,2,3,4,5,6]
b = [2,3]
for i in b:
if i in a:
a.remove(i)
print(a)
the output is [1,4,5,6]I hope, it will work
输出是[1,4,5,6]我希望的，它会起作用
回答by Kaung Yar Zar
a={1,2,4,5,6}
b={5,6,4,9}
c=(a^b)&b
print(c) # you got {9}
回答by chandra singh
e, f are two list you want to check disjoint
e, f 是要检查的两个列表不相交
a = [1,2,3,4]
b = [8,7,9,2,1]
c = []
def loop_to_check(e,f):
for i in range(len(e)):
if e[i] not in f:
c.append(e[i])
loop_to_check(a,b)
loop_to_check(b,a)
print(c)
## output is [3,4,8,7,9]
This loops around to list and returns the disjoint list
这会循环列出并返回不相交的列表
回答by Apeasant
The best way is a list comprehension.
最好的方法是列表理解。
a = [ 1,2,3,4]
b = [ 8,7,9,2,1]
c = [ element for element in a if element not in b]
d = [ element for element in b if element not in a]
print(c)
# output is [ 3,4]
print(d)
# output is [8,7,9]
You can join both lists
您可以加入两个列表
