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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 indices_of_flag(self, start_time, duration, times, padding=0):
 """ Return the indices of the times lying in the flagged region Parameters start_time: int Beginning time to request for duration: int Number of seconds to check. padding: float Number of seconds to add around flag inactive times to be considered inactive as well. Returns ------- indices: numpy.ndarray Array of indices marking the location of triggers within valid time. """

        from pycbc.events.veto import indices_outside_times
        sr = self.raw_buffer.sample_rate
        s = int((start_time - self.raw_buffer.start_time - padding) * sr) - 1
        e = s + int((duration + padding) * sr) + 1
        data = self.raw_buffer[s:e]
        stamps = data.sample_times.numpy()

        if self.valid_on_zero:
            invalid = data.numpy() != 0
        else:
            invalid = numpy.bitwise_and(data.numpy(), self.valid_mask) \
                    != self.valid_mask

        starts = stamps[invalid] - padding
        ends = starts + 1.0 / sr + padding * 2.0
        idx = indices_outside_times(times, starts, ends)
        return idx