Why The Output is this.

Question

I just wanted to know, why this output have been occurred.
Please answer with a brief explanation.
https://code.sololearn.com/cl0QXdS13RR8/?ref=app

Answer 1

x[2:2] means at position 2 you are inserting a list.last 2 is not included.

Answer 2

list[start:end:step]