关键是要确保两个单选按钮共享相同的变量。然后，要知道选择了哪个变量，您只需要获取变量的值即可。
这是一个例子：
import tkinter
# function that is called when you select a certain radio button
def selected():
print(var.get())
root = tkinter.Tk()
var = tkinter.StringVar() #used to get the 'value' property of a tkinter.Radiobutton
# Note that I added a command to each radio button and a different 'value'
# When you press a radio button, its corresponding 'command' is called.
# In this case, I am linking both radio buttons to the same command: 'selected'
rb1 = tkinter.Radiobutton(text='Radio Button 1', variable=var,
value="Radio 1", command=selected)
rb1.pack()
rb2 = tkinter.Radiobutton(text='Radio Button 2', variable=var,
value="Radio 2", command=selected)
rb2.pack()
root.mainloop()
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