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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def remainingBillingInterval(self):
 """ If the node has a launch time, this function returns a floating point value between 0 and 1.0 representing how far we are into the current billing cycle for the given instance. If the return value is .25, we are one quarter into the billing cycle, with three quarters remaining before we will be charged again for that instance. Assumes a billing cycle of one hour. :return: Float from 0 -> 1.0 representing percentage of pre-paid time left in cycle. """

        if self.launchTime:
            now = datetime.datetime.utcnow()
            delta = now - parse_iso_utc(self.launchTime)
            return 1 - delta.total_seconds() / 3600.0 % 1.0
        else:
            return 1