如何确定一个列表是否包含另一个列表中的项目，然后在 Python 中打印它们的索引

Question

I want to determine if one list has items contained in another list. If that's the case, I want to print the index of such items:

List1 = [10, 20, 30]
List2 = [10, 50, 80, 90, 20, 30, 40, 50]

For example, I want to find 10 in List1 which is present in List2 , and print index 0 . Is there any solution or direct function?

Answer 1

#Finding intersection between two lists 
inter=set(List1)&set(List2)
for val in inter:
    #prints index of value which contains on both lists
    print List2.index(val)

Answer 2

Using a for loop and index method

Demo:

List1= [10,20,30] 
List2=[10,50,80,90,20,30,40,50]
for i in List1:
    if i in List2:
        print(List2.index(i))

Answer 3

Try this ;)

List1,List2=[10,20,30],[10,50,80,90,20,30,40,50] #input
i = List1[0] #number you're looking for
for index in range(0,len(List2)):
    if List2[index] == i:
        print (index)   # if number is present

Answer 4

Try this:-

ls = [i for i,x in enumerate(List2) if x in List1]
print(ls)