Python Set difference()用法及代码示例

Python中两个集合之间的差异等于两个集合中元素数量之间的差异。函数difference()返回的集合是两个集合之间的差。让我们尝试找出两个集合A和B之间的区别。然后(集合A-集合B)将是集合A中的元素，但不是集合B中的(集合B-集合A)将是存在的元素在集合B中，但不在集合A中。
例：

set A = {10, 20, 30, 40, 80}
set B = {100, 30, 80, 40, 60}

set A - set B = {10, 20}
set B - set A = {100, 60}

Explanation:A - B is equal to the elements present in A but not in B
             B - A is equal to the elements present in B but not in A

让我们看一下以下差异集函数的维恩图。

用法:

set_A.difference(set_B) for (A - B)
set _B.difference(set_A) for (B - A)

在此程序中，我们将尝试通过两种方式找出两个集合set_A和set_B之间的差异：

# Python code to get the difference between two sets 
# using difference() between set A and set B 
  
# Driver Code 
A = {10, 20, 30, 40, 80} 
B = {100, 30, 80, 40, 60} 
print (A.difference(B)) 
print (B.difference(A))

{10, 20}
{100, 60}

我们还可以使用-运算符查找两组之间的差异。

# Python code to get the difference between two sets 
# using difference() between set A and set B 
  
# Driver Code 
A = {10, 20, 30, 40, 80} 
B = {100, 30, 80, 40, 60} 
print (A - B) 
print (B - A)

{10, 20}
{100, 60}