如果你不知道索引（Python），如何交换列表中的元素，同时保持它们的索引相同

Question

说我有这两个清单：

list1=["Green","2","Blue","4"]
list2=["1","Orange","3","red"]

如果我想将'3'与'blue'交换，如果我不知道列表中元素的位置，我该怎么办？

我正在使用Python 2.7

Answer 1

list1=["Green","2","Blue","4"]
list2=["1","Orange","3","red"]

l1 = list1.index("Blue")
l2 = list2.index("3")

list1[l1], list2[l2] = list2[l2], list1[l1]