1. Compose a function display_backwards that accepts a single positive integer (x) as an argument, and prints all integers on the interval [1, x) in descending order, each on its own line. If the argument is not a positive integer, the function should print nothing (not even a blank line). For example, display_backwards (10) # output (via print): # 9 # 8 # 7 # 6 # 5 # 4 # 3 # 2 # 1 display_backwards (-5) # (no text should be displayed)