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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, ValueError) as e:
    raise Exception("Please specify a numerical argument;", e)


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