input: Write a function to print a staircase of height 'n', where n is an integer. Character used in each step is '#'. Ensure leading spaces are printed prior to the '#' characters for proper alignment.
  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(10)
output: 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()