Printing Triangle (functions/book)

n = int(input())

def print_line(start, end):
  for i in range(start, end + 1):
    print(f"{str(i)} ", end="")
  print()

for i in range(0, n):
  print_line(1, i)

print_line(1, n)

for i in range(n - 1, 0, -1):
  print_line(1, i)