Thank you! I like the logic, it's precise and clear in the same time!

This one is better than the top answer.

Good logic

i agree I think this is the most elegant solution.

This is the least thing you should worry about regarding speed of Python code.

Wouldn't checking the iterable lenght every time make it slower?

It's a great and clever solution, you don't need to add new variables.
You just use the last element of the list.

And you are very intelligent to put in the second order this: item != res[-1]

Because of the lazy evaluation. Only it's evaluated the first bool result if it's a empty list
so you don't need to worry of the second one.

Thank you :)

took me a while to realise how it works. less variable and straighforward too. i like

Thats a good one, using results list to check, nice

this should be top solution

Thank you for your answer！

Have a look there: https://docs.python.org/3/tutorial/introduction.html#lists

Actually, I don't quite understand res[-1]……

great solution, couldn't think of that and learned something new thanks to you.

this is a great solution. Specially the -1 part. I was so caught up, I didn't think about it.