Python中輸出由三角形組成的三角形？

pattern = input("請輸入你要選擇的模式：") while True: if pattern == "A": row = eval(input("請輸入行數：")) for i in range(1, row + 1): for j in range(1, i+1): print(j, end=" ") print("") elif pattern == "B": row = eval(input("請輸入行數：")) for i in range(1, row + 1): for j in range(1, row - i + 2): print(j, end=" ") print("")