new_contents: # Fibonacci numbers module
  
  def fib(n):    # write Fibonacci series up to n
      a, b = 0, 1
      while b < n:
          print(b, end=' ')
          a, b = b, a+b
      print()
  
  
  def fib2(n):    # return Fibonacci series up to n
      result = []
      a, b = 0, 1
      while b < n:
          result.append(b)
          a, b = b, a+b
      return result
  
subject: add fibo.py