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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 update_rba(self, current_extent):
        # type: (int) -> None
        '''
        A method to update the current rba for the ISO hybridization.

        Parameters:
         current_extent - The new extent to set the RBA to.
        Returns:
         Nothing.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('This IsoHybrid object is not yet initialized')

        self.rba = current_extent