Tkinter - 用于跟踪其他变量的变量的变量

Question

所以我有这段代码：

for p in self.ProductNames:
    OptionMenuVar = StringVar()
    menu = OptionMenu(self.FrameProducts, OptionMenuVar, *self.ProductNames)
    OptionMenuVar.set(p)

    AgeVar = StringVar()
    AgeEntry = Entry(self.FrameProducts,width=15,textvariable=AgeVar,state="readonly",justify=CENTER)

生成此UI：

问题

如何跟踪OptionMenuVar中的更改并根据所选值更新AgeVar？

我看过The Variable Classes。我想我知道如何追踪OptionMenuVar中的变化，但我仍然不知道如何：

1. 检测新值
2. 根据新值
更新AgeVar

Answer 1

所以这是做到这一点的方法：

def OnOptionMenuChnage(omv,av, *pargs):
    print omv.get(), av.get()
    # do more. set av value based on omv value

OptionMenuVar.trace("w", lambda *pargs: OnOptionMenuChnage(OptionMenuVar,AgeVar, *pargs))

完整代码

for p in self.ProductNames:
    OptionMenuVar = StringVar()
    menu = OptionMenu(self.FrameProducts, OptionMenuVar, *self.ProductNames)
    OptionMenuVar.set(p)

    AgeVar = StringVar()
    AgeEntry = Entry(self.FrameProducts,width=15,textvariable=AgeVar,state="readonly",justify=CENTER)

    def OnOptionMenuChnage(omv,av, *pargs):
        print omv.get(), av.get()
        # do more. set av value based on omv value

    OptionMenuVar.trace("w", lambda *pargs: OnOptionMenuChnage(OptionMenuVar,AgeVar, *pargs))

所有归功于Marcin answer。