How to use the hypixel.Player.getLevel function in hypixel

def getPlayerInfo(self):
        """ This is a simple function to return a bunch of common data about a player. """
        JSON = self.JSON
        playerInfo = {}
        playerInfo['uuid'] = self.UUID
        playerInfo['displayName'] = Player.getName(self)
        playerInfo['rank'] = Player.getRank(self)
        playerInfo['networkLevel'] = Player.getLevel(self)
        JSONKeys = ['karma', 'firstLogin', 'lastLogin',
                    'mcVersionRp', 'networkExp', 'socialMedia', 'prefix']
        for item in JSONKeys:
            try:
                playerInfo[item] = JSON[item]
            except KeyError:
                pass
        return playerInfo