Maybe you could look yourself and see if you agree with said system?
What value does that variable refer to after your code has finished, and what should it be? That’s what that message is saying is the problem, so that’s something you could look at.
If you by right answer mean that you’re looking at something being printed out, then that’s not what the error message is complaining about, if that’s the case you’re looking at the wrong thing.
And then if you do end up agreeing that this is wrong, you could start making observations about what individual operations you’re carrying out. When exactly does your code do something that you don’t agree with?
With this comprehension list I loop through each author in the original list; I split each authors ítem which then turns into an individual list of [name, lastname], and then I select the first negative index of each of this individual lists.
Have you tried checking what does get produced for the statements executed in your code? A couple of print statements at each step should help to make sure that the code you wrote is behaving as expected.
It’s also worth having a glance at this FAQ which describes how to format code you post to the forums so that it maintains indentation and such-
it even features that searching for answers first is a good idea.
What does [-1] do? Well, we can access elements in a list by index, by using negative values, we can access elements from the right hand side. So -1 is the last item of a list, -2 the second to last item of the list and so forth
Could someone remind me where we can find explanation in previous lessons that says we can write methods “.split” and index "[-1] in the same line like here: some_str.split()[-1]? Because i don’t really remember anything like that. But i do remember that there was about different methods in one line, but not indexes.
Also another solution to the second part of this exercise is by list comprehension:
author_last_names = [full_name.split()[-1] for full_name in author_names]
I couldn’t stop myself from admiring such a beautiful code where all the three activities of splitting with () delimiter + extracting last element with [-1] + appending to the empty list is done in a single line of code.
I was wondering how many years’ of experience is required to look our code more professional.
Your code should get better constantly. Programming is a constant learning process. The more important thing (in my opinion) is when you look at code you wrote half a year to a year ago, and feel like you could do better now
Hi this code and exercise is very useful for understanding and splitting list items but the lesson could have been introduced clearer and more sequentially. The overabundance of posts may be an indicator that the lesson is confusing from the perspective of introducing a new concept in py.
I am also confused by this. How does it know when we use split() or [-1] that it’s accessing the list of characters from the last name and not the first? And if we wanted to access the entire last name, wouldn’t we use [:-1] and not just [-1]? I thought [-1] would just give us one single character in the list.