input: Write a function to print a staircase of height 'n', where n is an integer. The staircase should be right-aligned with '#' symbols. If n is 0, the function should print an empty line.
  
  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)=="    #\n   ##\n  ###\n ####\n#####\n"
  assert staircase(0)==""
  assert staircase(3)=="  #\n ##\n###\n"
  assert staircase(1)=="#\n"
  assert staircase(2)==" #\n##\n"
output: def staircase(n):
      for i in range(1, n + 1):
          print(' ' * (n - i) + '#' * i)