Python Programmers

The source code below displays two different patterns. Now, can someone please explain to me what exactly each line and each loop is doing so I can have a more profound understanding of the program, please. I do not need a solution to the code, since it is correct, all I need is an explanation of what each line does. Thanks.

ROWS = 10 print("Pattern A") for num1 in range(ROWS + 1): for num2 in range(ROWS - num1): print(" ", end="") for num3 in range((num1 * 2) - 1): print("+", end="") print()

print("Pattern B") for num1 in range(ROWS, 0, -1): for num2 in range(ROWS - num1): print(" ", end="") for num3 in range((num1 * 2) - 1): print ("+", end="") print()

Results of source code:

Pattern A + +++ +++++ + ++++ ++ -++ Pattern B +++ +++ +- + ++ ++ ++ +++ +