n = 4 m = 5 while n >= 1: print('{}{}'.format(''*m, '*'*(2*n-1)))

The output of this code would be:

*****
***
*
*

This code uses a while loop to print out a diamond shape made of asterisks. The loop starts with n = 4 and m = 5 (which determines the number of spaces before each line), and then prints out a line of asterisks with a length of 2*n-1.

On the first iteration, n is 4, so the line printed is '*****' with 5 spaces before it. On the second iteration, n is decremented to 3, so the line printed is '***' with 6 spaces before it. This pattern continues until n is 1, at which point the loop terminates and the last line printed is a single asterisk with 8 spaces before it.

Overall, this code generates a simple diamond shape made of asterisks, with the widest point at the top and the narrowest point at the bottom.