python tkinter中单选框Radiobutton的问题

Question

设计一个问答游戏，由tkinter显示，sqlite作为数据库，每个智力问答由题目，四个选项和正确答案（question，answer_A,answer_B,answer_C,answer_D,right_answer)组成。程序中从试题库中读取题目显示在GUI界面中供用户答题。在界面设计时，智力问答题目是标签空间，4个选项是单选按钮控件，在“下一题”按钮单击事件中实现题目的切换和对错判断，如果正确得分socre加10分，错误不加分，并判断用户是否做完。在“结果”按钮单击事件中实现得分socre的显示

sqlite生成生成试题库，读取试题信息都没有问题，在设计tkinter时，显示完第一题的选项后，第二题的选项并没有覆盖第一题的选项，而是显示在第一题的下方。

相关代码

// 请把代码文本粘贴到下方（请勿用图片代替代码）

import sqlite3
import tkinter as tk
import tkinter.messagebox
window=tk.Tk()
window.title('Python智力问答游戏')
window.geometry('400x400')
v=tk.StringVar()
v.set(1)
score=0
num=0
conn = sqlite3.connect('test.db')
c=conn.cursor()
c.execute('''CREATE TABLE IF NOT EXISTS COMPANY 
       (QUESTION      TEXT     NOT NULL,
       ANSWER_A       TEXT     NOT NULL,
       ANSWER_B       TEXT     NOT NULL,
       ANSWER_C       TEXT,
       ANSWER_D       TEXT,
       RIGHT_ANSWER   TEXT);''')
c = conn.cursor()

c.execute("INSERT INTO COMPANY (QUESTION,ANSWER_A,ANSWER_B,ANSWER_C,ANSWER_D,RIGHT_ANSWER) \
      VALUES ('q1','PAUL','TT','TEXAS','RIGHT','a1')")    #题目具体内容先由此代替
c.execute("INSERT INTO COMPANY (QUESTION,ANSWER_A,ANSWER_B,ANSWER_C,ANSWER_D,RIGHT_ANSWER) \
      VALUES ('q2','mike','yy','u','RIGHT','a2')")
c.execute("INSERT INTO COMPANY (QUESTION,ANSWER_A,ANSWER_B,ANSWER_C,ANSWER_D,RIGHT_ANSWER) \
      VALUES ('q3','luke','TT','jj','RIGHT','a3')")
c.execute("INSERT INTO COMPANY (QUESTION,ANSWER_A,ANSWER_B,ANSWER_C,ANSWER_D,RIGHT_ANSWER) \
      VALUES ('q4','lina','TT','Tty','RIGHT','a4')")


cursor=c.execute("select QUESTION, ANSWER_A, ANSWER_B, ANSWER_C, ANSWER_D, RIGHT_ANSWER from COMPANY")
value=cursor.fetchall()

var=tk.StringVar()
var.set(value[0][0])
l1=tk.Label(window,textvariable=var)
l1.pack()

**def next_and_judge():          ##出错部分
   global score
   global num
   r1 = tk.Radiobutton(window, text=value[num][num+1], variable=v, value=1)
   r1.pack()
   r2 = tk.Radiobutton(window, text=value[num][num+2], variable=v, value=2)
   r2.pack()
   r3 = tk.Radiobutton(window, text=value[num][num+3], variable=v, value=3)
   r3.pack()
   r4 = tk.Radiobutton(window, text=value[num][num+4], variable=v, value=4)
   r4.pack()
   num=num+1
   if var.get()==value[num-1][5]:
        score=10+score
b1=tk.Button(window,text='xiayiti',command=next_and_judge)
b1.pack()**

def sum():
    tkinter.messagebox.showinfo(title='END',message=str(score))

b2=tk.Button(window,text='结束')
b2.pack()


conn.commit()
print('operation done successfully')
conn.close()
window.mainloop()

第一题覆盖显示第二题的选项，按下按钮“下一题”切换题目。

Answer 1

因为执行netxt_and_judge()会生成新的Radiobutton.
可以重复使用一个Radiobutton, 然后使用Radiobutton.config去改变text的值:

...
r1 = tk.Radiobutton(window, text=value[num][num+1], variable=v, value=1)
r1.pack()
r2 = tk.Radiobutton(window, text=value[num][num+2], variable=v, value=2)
r2.pack()
r3 = tk.Radiobutton(window, text=value[num][num+3], variable=v, value=3)
r3.pack()
r4 = tk.Radiobutton(window, text=value[num][num+4], variable=v, value=4)
r4.pack()

def next_and_judge():
    global score
    global num
    r1.config(text=value[num][num+1])
    r2.config(text=value[num][num+2])
    r3.config(text=value[num][num+3])
    r4.config(text=value[num][num+4])
    num=num+1
    ...

参考:The Tkinter Radiobutton Widget