def num_employers(self, num_employers):
        '''Sets the number of employer bees; at least two are required

        Args:
            num_employers (int): number of employer bees
        '''

        if num_employers < 2:
            self._logger.log(
                'warn',
                'Two employers are needed: setting to two'
            )
            num_employers = 2
        self._num_employers = num_employers
        self._logger.log('debug', 'Number of employers set to {}'.format(
            num_employers
        ))
        self._limit = num_employers * len(self._value_ranges)
        self._logger.log('debug', 'Limit set to {}'.format(self._limit))
Sets the number of employer bees; at least two are required

        Args:
            num_employers (int): number of employer bees