逻辑运算符 and

参见 python之逻辑运算符的返回值

1. 看下面代码

   a = set([1, 2, 3, 4, 5])
   b = set([4, 5, 6, 7, 8])
   c=a and b
   print(a)
   print(b)
   print(c)
   

   返回结果如下：

   {1, 2, 3, 4, 5}
   {4, 5, 6, 7, 8}
   {4, 5, 6, 7, 8}
   

2. 看下面代码

   a = set()
   b = set([4, 5, 6, 7, 8])
   c=a and b
   print(a)
   print(b)
   print(c)
   

   返回结果如下：

   set()
   {4, 5, 6, 7, 8}
   set()
   

例子：

a = set()
b = 0
c=a and b
print(a)
print(b)
print(c)

结果是什么？

逻辑运算符 or

1. 看下面的代码：

   a = 0
   b = set()
   c=a or b
   print(a)
   print(b)
   print(c)
   

   返回结果如下：

   0
   set()
   set()
   

2. 看下面代码

   a = set([1, 2, 3, 4, 5])
   b = set([4, 5, 6, 7, 8])
   c=a or b
   print(a)
   print(b)
   print(c)
   

   返回结果如下：

   {1, 2, 3, 4, 5}
   {4, 5, 6, 7, 8}
   {1, 2, 3, 4, 5}
   

例子

a = set()
b = set([4, 5, 6, 7, 8])
c=a or b
print(a)
print(b)
print(c)

的结果是：

set()
{4, 5, 6, 7, 8}
{4, 5, 6, 7, 8}