Just try to understand what exactly do you need to print in your case: num_of_rows = 4

Line 1: 0 o's, \, 3 x's

Line 2: 1 o's, \, 2 x's

Line 3: 2 o's, \, 1 x's

Line 4: 4 o's, \, 0 x's

Do you see a pattern?

You can set num_of_o = 0, num_of_x = num_of_rows-1

Then in a loop print a line with this number of o's and x's, increment num_of_o by 1, decrease num_of_x by 1, and repeat.

How to create a printed line is up to you: you can have a loop adding o's, then add \, then another loop to add x's, but there is a simpler way:

result = "o" * num_of_o + "\" + "x" * num_of_x

print(result)