Why this output ????

Question

https://code.sololearn.com/ci3jHLX5pM0i/?ref=app

Answer 1

Because the list elements are not numbers , so when you add "5"+" 2"+"3" you get "523" .

Answer 2

btw: You can simplify your while loop.

while x:
y += x.pop()

The method pop removes the last element from the list and returns it - so exactly what you want here.

Answer 3

You are relatively far in your Python tutorial, so you must have read it.

You should reread that chapter and experiment to get a feeling how it works.

Simply spoken it works like if: with a condition, for example x<5.

If x<5:
do this or that.

And while just means that as long as x < 5, the loop runs again and again and again, even forever - until (by the code inside the while block) x changes and is not <5 anymore.

Im your example while x means:

while there is anything at all in the list x...

Answer 4

honfu thanks a lot for clearing my doubt

Answer 5

My pleasure. :)

Answer 6

why new x is an empty list???

Answer 7

You always restore a one element smaller list in your x, and you do that 'while x'.

So in the last round you store everything except the last element as before - but given a one element list [3] that is... nothing.

[3] - last element == []

Answer 8

I am not getting how while is working
please some one explain me

Answer 9

So you haven't written the code yourself?

Answer 10

it was given in our book excercise

Answer 11

Anyway, loops are really important (like 90% of what's in the tutorial), so be sure to review all of that and write your own practice codes!