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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 label_for_waypoint(self, wp_num):
        '''return the label the waypoint which should appear on the map'''
        wp = self.module('wp').wploader.wp(wp_num)
        command = wp.command
        if command not in self._label_suffix_for_wp_command:
            return str(wp_num)
        return str(wp_num) + "(" + self._label_suffix_for_wp_command[command] + ")"