How to compare elements in two separate lists

[Avatar19]

Hi, I would like to compare elements in two seperate Lists for example:

List1=[['Primi ', ' Movida ', ' 5'], ['Primi ', ' CCHQ ', ' 40'], ['Primi ', ' Chicago ', ' 45']]

List2=[['Chicago ', ' The Doors ', ' 20'], ['CCHQ ', ' The Doors ', ' 10']]

What I understand is that the syntax should look like this:

List3
for i in List2:
    for j in List1:
             if i[0]==j[1]
                 List3.append(j)

What i specifically would like to do is that in List1. If List1[i][1] is found in List2[j][0] then i would like to pull out the List1 elements for which this is True.
Please help I am very confused!
Thanks

[Nonemsludo]

 d=[i[1] for i in List1 if i[1]==j[0] for j in List2]
return d 
 f=[elem for elem in d if elem==elem in list1

[Avatar19]

Thanks for the reply, i did manage to figure it out eventually but I am interested in this syntax, I've tried it an it doesn't seem to work??

[bvdet]

Something is not right about the code Nonemsludo posted. A return statement out of the blue?

He was trying to show you a list comprehension. Here's my contribution:

List3 = [item for item in List1 if item[1].strip() in [item[0].strip() for item in List2]]

Apparently you have some extra spaces. The strip() method gets rid of the spaces for the comparison to work.

[Avatar19]

Hey bv thanks for the help, but just one thing I noticed is that with using "item" as the iteration variable in both lists seems to confuse the output, but otherwise perfect solution, Thanks!!

[bvdet]

I am thinking the inner list comprehension is executed first then the outer. I like using item as the variable name for list iteration.

[Avatar19]

Oh ok, I see it does work I just reversed the Lists and it gave the right result, is this how it was meant to be?

original:

List3 = [item for item in List1 if item[1].strip() in [item[0].strip() for item in List2]]

reversed:

List3=[item for item in List2 if item[0].strip() in[item[1].strip() for item in List1]]

Thanks for the help bv
Ava