Question

我不知道为什么但是在每个应该显示字符串的地方我都有PY_VAR＃（＃是一个数字）。例如，它不显示“此区域显示来自从站的消息”，而是显示PY_VAR1。我的代码是

#!/usr/bin/python
# -*- coding: utf-8 -*-

import tkinter

class Display(tkinter.Tk):
    def __init__(self,parent):
        tkinter.Tk.__init__(self,parent)
        self.parent = parent
        self.initialize()

    def initialize(self):
        self.grid()

        self.MessageString = tkinter.StringVar()
        MessageDisplay = tkinter.Label(self, text = self.MessageString, anchor = 'nw' , justify = 'left')
        MessageDisplay.grid(columnspan = 3)

        self.ClockString = tkinter.StringVar()
        ClockDisplay = tkinter.Label(self, text = self.ClockString)
        ClockDisplay.grid(row=0)

        self.Menu1Title = tkinter.StringVar()
        Menu1Button = tkinter.Button(self, text = self.Menu1Title, command = self.SetMenu(MenuIndex = 1))
        Menu1Button.grid(column = 0, columnspan = 2)

        self.Menu2Title = tkinter.StringVar()
        Menu2Button = tkinter.Button(self, text = self.Menu2Title, command = self.SetMenu(MenuIndex = 2))
        Menu2Button.grid(column = 0, columnspan = 2)

        self.Menu3Title = tkinter.StringVar()
        Menu3Button = tkinter.Button(self, text = self.Menu3Title, command = self.SetMenu(MenuIndex = 3))
        Menu3Button.grid(column = 0, columnspan = 2)

        self.MenuDescriptionContent = tkinter.StringVar()
        MenuDescription = tkinter.Label(self, text = self.MenuDescriptionContent, anchor = 'nw', justify = 'left')
        MenuDescription.grid(column = 2, columnspan = 2, row = 1, rowspan = 3)

        """Temporary variables"""

        self.MessageString = "This area shows messages coming from the slave"
        self.ClockString = "00:00"
        self.Menu1Title = "Menu 1"
        self.Menu2Title = "Menu 2"
        self.Menu3Title = "Menu 3"
        self.MenuDescriptionContent = "This area shows the description of the selected menu"

    def SetMenu(self, MenuIndex):
        pass

if __name__ == "__main__":
app = Display(None)
app.title('Web Bell')
app.mainloop()

控制台中没有显示任何错误。提前感谢您的回复

Answer 1

如果您想要StringVar的值，则必须使用get方法：

MessageDisplay = tkinter.Label(..., text = self.MessageString.get(), ...)

如果您使用StringVar作为textvariable属性的值，那么您不需要这样做的唯一时间。

您的代码中还有其他问题。执行self.MessageString = "This area..."时，您没有设置文本变量，实际上是将其丢弃并更改self.MessageString以引用字符串。

相反，您需要调用变量的set方法，如下所示：

self.MessageString.set("This area...")

使用字符串而不是PY_VAR

1 个答案: