input: 
  def Fibonacci(n):
      """
      Generate a Fibonacci sequence of first n numbers.
      Example:
      >>> Fibonacci(5)
      0
      1
      1
      2
      3
      """
      if n == 1:
          return 0
      elif n == 2:
          return 1
      else:
          return Fibonacci(n - 1) + Fibonacci(n - 2)
  
  n = 10
  for i in range(1, n + 1):
      print(Fibonacci(i))
  
output:     a, b = 0, 1
      for _ in range(n):
          print(a)
          a, b = b, a + b