Point Buy Calculator in Tk

import tkinter as tk
import tkinter.simpledialog as sdg
import tkinter.messagebox as mbx

class pointBuyRoot(sdg.Dialog):
    def body(self, master):
        self.title("New Character: Point-Buy Stats")
        self.resizable(False, False)

        self.STR = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Strength", command = self.calculatePoints)
        self.DEX = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Dexterity", command = self.calculatePoints)
        self.CON = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Constitution", command = self.calculatePoints)
        self.INT = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Intelligence", command = self.calculatePoints)
        self.WIS = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Wisdom", command = self.calculatePoints)
        self.CHA = tk.Scale(master, from_ = 8, to = 15, orient = "horizontal", label = "Charisma", command = self.calculatePoints)

        self.currentPoints = tk.IntVar()
        self.currentPoints.set(0)

        tk.Label(master, textvariable = self.currentPoints).grid(row = 0)

        self.STR.grid(row = 1)
        self.DEX.grid(row = 2)
        self.CON.grid(row = 3)
        self.INT.grid(row = 4)
        self.WIS.grid(row = 5)
        self.CHA.grid(row = 6)



    def validate(self):
        if self.currentPoints.get() == 27:
            return 1
        else:
            mbx.showerror("Error", "You need to use exactly 27 points to have valid values!")
            return 0

    def apply(self):
        resultString = ""

        resultString += str(self.STR.get()) + "|"
        resultString += str(self.DEX.get()) + "|"
        resultString += str(self.CON.get()) + "|"
        resultString += str(self.INT.get()) + "|"
        resultString += str(self.WIS.get()) + "|"
        resultString += str(self.CHA.get())

        self.result = resultString

    def calculatePoints(self, changedSlider):
        currentScores = []

        currentScores.append(self.STR.get())
        currentScores.append(self.DEX.get())
        currentScores.append(self.CON.get())
        currentScores.append(self.INT.get())
        currentScores.append(self.WIS.get())
        currentScores.append(self.CHA.get())

        pointsUsed = 0

        for score in currentScores:
            if score < 14:
                pointsUsed += score - 8
            elif score == 14:
                pointsUsed += 7
            elif score == 15:
                pointsUsed += 9

        self.currentPoints.set(pointsUsed)

base = tk.Tk()
pointBuyRoot(base)