input: Write a function to print a staircase of height 'n', where 'n' is an integer. The staircase should be right-aligned and each level should consist of '#' symbols. If 'n' is 0, the function should print nothing.
  def staircase(n): 
      for i in range(0, n): 
          for j in range(0, n - i - 1): 
              print(end=" ") 
          for j in range(0, i + 1): 
              print("#", end="") 
          print("\r") 
    
  assert staircase(5)
  assert staircase(3)
  assert staircase(0)
  assert staircase(1)
  assert staircase(7)
output: def staircase(n): 
      for i in range(n): 
          print(' ' * (n - i - 1) + '#' * (i + 1))