What is the correct way to create a loop using two values of the same position on different lines?

Question

After collecting values, list_3 is created for example:

list_1 = ['a','b','c','d']
list_2 = ['e','f','g','h']
list_3 = [list_1,list_2]

I would like to print the results in this model text sequence:

a and e

b and f

c and g

d and h

I tried to use it as follows:

for i, event in enumerate(list_3):
    print(list_3[i][i] + ' ' + list_3[i+1][i])

But it returned in error:

    print(list_3[i][i] + ' ' + list_3[i+1][i])
IndexError: list index out of range

What is the correct way to proceed to recover the corresponding prints?

It's much easier to find answers for this kind of thing when you know the terminology. — Karl Knechtel, Jan 18 '22 at 03:10
In fact @KarlKnechtel . Worst of all is that I searched but couldn't find the answer exactly because of the words to be searched! — Digital Farmer, Jan 18 '22 at 03:11

score 2 · Answer 1 · answered Jan 18 '22 at 03:09

2

Use zip() to traverse multiple lists in parallel:

for x, y in zip(*list_3)):
    print(f"{x} and {y}")

answered Jan 18 '22 at 03:09

Barmar

score 1 · Answer 2 · answered Jan 18 '22 at 03:09

1

Instead of enumerate, use zip. zip allows you to iterate over the two lists together:

for i,j in zip(list_1, list_2):
    print(i + ' and ' + j)

Output:

a and e
b and f
c and g
d and h

answered Jan 18 '22 at 03:09

2 Answers2