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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 next_open(self, dt):
 """ Given a dt, returns the next open. If the given dt happens to be a session open, the next session's open will be returned. Parameters dt: pd.Timestamp The dt for which to get the next open. Returns ------- pd.Timestamp The UTC timestamp of the next open. """

        idx = next_divider_idx(self.market_opens_nanos, dt.value)
        return pd.Timestamp(self.market_opens_nanos[idx], tz=UTC)