In short( Extremly short) the [:size] is slicing it until the number you put there so if it's 6, the output is up to index 6 but not included (remember the index in python starts at 0)
so it '10' * 6 and it omitts the 6th index.

[012345] - index
[101010] - ouput

It's Python list comprehension. Make a research about it if you don't know it. For the rest, take a pencil and a paper with a small example and try to figure out what the code does.

can anybody explain this code? It looks easy to the eye but hard to understand it

Can anyone please explain me how the [:size] works?

I did it but making it way more complex

it happens!

I wanted to do something like that but I couldn't think of how to do it. Great way to do it!!