Avoid using loop variable outside the loop

[DimitriPapadopoulos]

Although that's not the case here, the variable will be undefined if the list is empty.

[FrancescAlted]

LGTM. Thanks @DimitriPapadopoulos !

[FrancescAlted]

For some reason, this made CI to crash. It is strange that it passes the tests in the PR though... I just removed this one from main.

[DimitriPapadopoulos]

I fixed the issue manually. Somehow, at the moment I was writing this, I thought len() can iterate to get the length. Of course, that's wrong:

>>> z = zip([1, 2, 3], [11, 22, 33])
>>> 
>>> len(z)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object of type 'zip' has no len()
>>> 
>>> len(list(z))
3
>>> 

Sorry about that.