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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 _gate_pre_offset(self, gate):
 """ Return the offset to use before placing this gate. :param string gate: The name of the gate whose pre-offset is desired. :return: Offset to use before the gate. :rtype: float """

        try:
            gates = self.settings['gates']
            delta_pos = gates[gate.__class__.__name__]['pre_offset']
        except KeyError:
            delta_pos = self._gate_offset(gate)
        return delta_pos