从另一个类更改变量

Question

我试图弄清楚如何从外部python文件更改mValue的值。这是我的代码，我不太清楚如何处理这个问题。

game.py

mValue= 0
gHome = GUI_Button()
gHome.lGui('sGui_hotbar.png', 0, 40, 50, 50, 0, 2, 1, 2)
gMove = GUI_Button()
gMove.lGui('sGui_hotbar.png', 0, 100, 50, 50, 0, 0, 1, 0)

while True:        
    gHome.uGui(lm, mX, mY, mValue)
    gMove.uGui(lm, mX, mY, mValue)

sprite_classes.py

class GUI_Button(Sprite):
    def lGui(self, file, x, y, w, h, fx1, fy1, fx2, fy2):
            Sprite.load(self, file, x, y, w, h, fx1, fy1, fx2, fy2)
            self.originX = x
            self.originY = y

    def uGui(self, mouseDown, mouseX, mouseY, money):
        if self.clicked:
            self.sFC = self.sF2
            money += 1
        else:
            self.sFC = self.sF1

        Sprite.update(self, mouseDown, mouseX, mouseY)