# Loop between two lists until element match

I want the `out_list` to loop until it found a match inside `in_list`. i did try to increase the index if the element mismatch to make the element in `out_list` match with coming `in_list`.

``````in_list = [1,2,2,1,3,4]
out_list = [1,2,3,2,1,4]

index = 0
for out in out_list:
print(out, in_list[index])
if out == in_list[index]:
print('match')
index = index + 1
else:
print('loop until match')
index = index + 1
``````

The first two element for `1` and `2` in both `in_list` and `out_list` will print ‘match’. but the element for ‘3’ should iterate until it found a match. but apparently it does not.

well the expected output would be always print ‘match’ as i want it to always loop until it find a match

### >Solution :

This is not an answer, but are you expecting something like this? (Ignore the `print('\nNext Iteration in out_list:')` line, its just for debugging)

``````in_list = [1,2,2,1,3,4]
out_list = [1,2,3,2,1,4]

for i in out_list:
print('\nNext Iteration in out_list:')
for j in in_list:
print('  ', i, j, end=' ')
if i == j:
print('match')
break
print()
# else:
#     print('loop until match')
``````

Output:

``````
Next Iteration in out_list:
1 1 match

Next Iteration in out_list:
2 1
2 2 match

Next Iteration in out_list:
3 1
3 2
3 2
3 1
3 3 match

Next Iteration in out_list:
2 1
2 2 match

Next Iteration in out_list:
1 1 match

Next Iteration in out_list:
4 1
4 2
4 2
4 1
4 3
4 4 match
``````