python之查找列表中包含的字符的位置

如果我得到这个变量

operator = ["&", "/", "->", "<->", "X", "I"] 
expression = "p&q->rXq" 

我怎样才能返回"&" 和"X" 在`operator 中的位置？我需要这样的输出:

1:0, 3:2, 6:4 
#1 for "&", 3 for "->", 6 for "X" inside expression variable. 
#0 for "&", 2 for "->", 4 for "X" inside operator List. 

请您参考如下方法:

operator = ["&", "/", "->", "<->", "X", "I"] 
expression = "p&q->rXq" 
print(operator.index("<->")) 

这将显示输出:

3

这是你想要的吗？