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#!/usr/bin/env python3

import sys

def fib(n):
   a, b = 0, 1
   while a<n:
      print(a)
      a, b = b, a+b


try:
   n = int(sys.argv[1])
except IndexError:
   raise SystemExit("Please specify a limit. E.g. \"fib.py 13\"")

print("Creating fibonacci sequence limited to: ", n)
fib(n)