Python:从另一个函数访问功能

我正在尝试从另一个函数访问函数中的条目。但是它告诉我它没有定义。我一直在研究很多，但我似乎找不到任何帮助我的东西。

这是我的代码，我一直在缩短它，以使你们更容易。虽然应该足以给您这个主意。

from tkinter import*
class hunterClass:
    def BMHunter():
        hunter = Tk()
        hunter.title("Beast Mastery Gear Worth Calculator")
        agiString = StringVar()
        agiText = Label(hunter, text = "Input points of agility:").grid(row = 3, column = 0)
        agiEntry = Entry(hunter, textvariable = agiString).grid(row = 3, column = 1)
        calculate = Button(hunter, text = "Calculate", command = hunterClass.calculateFun).grid(row = 12, column = 1)
    def calculateFun():
        agiF = float(agiEntry.get())
window = Tk()
window.title("Gear Worth Calculator")
hunterText = Label(window, text = "Hunter").grid(row = 3, column = 0)
hunterBM = Button(window, text = "Beast Mastery", width = 12, command = hunterClass.BMHunter).grid(row = 4, column = 0)