If inscribe!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

CodePudding user response:

[[None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None], [None, None, None, None, None]]

If n=5, is a list of 5 * 5 content to none

CodePudding user response:

This code means is equivalent to:

 board=[] 
For I in range (n) : 
List_1=[] 
For j in range (n) : 
List_1. Append (None) 
Board. Append (list_1) 

Just so we can simplify the code