new_contents: #!/usr/bin/python
  
  import sys
  
  def fib(n):
   a,b = 0,1
   yield a
   if n>0 :
    yield b
    for i in range(2,n+1):
     a,b = b, a+b
     yield b
  
  num = int(sys.argv[1])
  gen = fib(num)
  for i in gen:
   print i
  
subject: Add function for Fibonacci sequence