Question

我已重写了此link中显示的示例！

代码如下所示：

from tkinter import *


def sel():
    if var.get()==1:
        area.delete(1.0, END)
        area.insert(END, "Bienvenue")
    elif var.get()==2:
        area.delete(1.0, END)
        area.insert(END, "Welcome")
    else:
        selection = "You selected the option " + str(var.get())
        label.config(text = selection)
        area.delete(1.0, END)
        area.insert(END,selection)

root = Tk()


area = Text(root)
area.pack()


var = IntVar()
R1 = Radiobutton(root, text="Option 1", variable=var, value=1,
                   command=sel)
R1.pack(anchor=W)


R2 = Radiobutton(root, text="Option 2", variable=var, value=2,
                   command=sel)
R2.pack(anchor=W)

R3 = Radiobutton(root, text="Option 3", variable=var, value=3,
                  command=sel)
R3.pack(anchor=W)


label = Label(root)
label.pack()

root.mainloop()

像这样，代码将在文本小部件中按照radiobutton值输入消息。示例：如果选择了option1，我将在文本小部件中显示消息“bienvenue”。

但是当我想把这个代码放在一个类对象中时，我的结果却不一样;这是代码：

from tkinter import *



class Example(Frame):

    def __init__(self, parent):
        Frame.__init__(self, parent)   

        self.parent = parent
        self.initUI()

    def initUI(self):

       m1 = PanedWindow()
       m1.pack(fill=BOTH, expand=1)
       """ La fenétre principale"""
       self.parent.title("Agent")
       self.pack(fill=BOTH, expand=1)

       area = Text(m1)
       area.pack()

       global var
       var = IntVar()
       R1 = Radiobutton(m1, text="Option 1", variable=var, value=1,
                           command=self.sel(area))
       R1.pack(anchor=W)

       R2 = Radiobutton(m1, text="Option 2", variable=var, value=2,
                           command=self.sel(area))
       R2.pack(anchor=W)

       R3 = Radiobutton(m1, text="Option 3", variable=var, value=3,
                          command=self.sel(area))
       R3.pack(anchor=W)


       label = Label(self)
       label.pack()


    def sel(self,area):
        if var.get()==1:
            area.delete(1.0, END)
            area.insert(END, "Bienvenue")
        elif var.get()==2:
            area.delete(1.0, END)
            area.insert(END, "Welcome")
        else:
            selection = "You selected the option " + str(var.get())
            #label.config(text = selection)
            area.delete(1.0, END)
            area.insert(END,selection)

def main():
    root = Tk()
    app = Example(root)   
    root.mainloop()  


if __name__ == '__main__':
    main()

当我使用类对象时，我不确定我做错了什么。那么请你帮我解决一下。

Answer 1

问题在于这一行（和其他两个按钮类似）：

R2 = Radiobutton(m1, text="Option 2", variable=var, value=2,
                       command=self.sel(area))

通过执行command=self.sel(area)，您将command设置为正在执行 self.sel(area)的结果，即None而不是方法self.sel本身。

相反，我建议您在所有代码中将area更改为self.area，并从sel方法中删除其他参数。

def initUI(self):
   ...
   self.area = Text(m1)
   ...
   R1 = Radiobutton(m1, text="Option 1", variable=var, value=1,
                       command=self.sel)
   ...

def sel(self):
    if var.get()==1:
        self.area.delete(1.0, END)
        ...
    ...

如何基于单选按钮选择tkinter在文本小部件中写入

1 个答案: