如何在 tkinter python 中强制选择单选按钮

Question

I am working on a small project to create a small window which will ask 3 questions and 2 options as radio buttons will be available for answers. After selecting the answers it will print the users details along with the answers which later i will add into a database. As of now it is working fine with selections, but if no button is selected and clicked on submit button it still picks the 2nd option and allows to enter. Here i want to add a check if no button is selected then a pop up should appear and should ask to select the buttons. I have googled a lot on making radio buttons mandatory but didn't find any appropriate answer. Can some one please help. Below is my code

from tkinter import *
import tkinter.messagebox
import getpass
import socket
from datetime import datetime

root=Tk()
root.title("Survey")
root.geometry("225x225")
root.config(bg="antique white")
root.resizable(width="false", height="false")


day_selected = IntVar()
mood_selected = IntVar()
work_selected = IntVar()

# creating values for entry

staffid = getpass.getuser()
machine = socket.gethostname()
now = datetime.now()
date_str = now.strftime("%d/%m/%Y %H:%M:%S")
day_sel = day_selected.get()

def done():
    print(staffid)
    print(machine)
    print(date_str)
    print(day_sel)
    print("Good" if day_selected.get()==1 else "BAD")
    print("Good" if mood_selected.get()==3 else "BAD")
    print("Good" if work_selected.get()==5 else "BAD")
    tkinter.messagebox.showinfo("Thank you", "Thank you for completing the survey !!!")

lab1 = Label(root, text="  How Was ?", font=("calibri", 20, "bold"), bg="antique white", fg="brown").pack()

lab2 = Label(root, text="Day", font=("calibri", 14, "bold"),bg="antique white")
lab2.place(x=8, y=50)
r1=Radiobutton(root,text="Good", font=("calibri",12), variable=day_selected, value=1,bg="antique white").place(x=110,y=52)
r2=Radiobutton(root,text="Bad",font=("calibri",12), variable=day_selected, value=2,bg="antique white").place(x=170,y=52)
lab3 = Label(root, text="Mood", font=("calibri", 14, "bold"),bg="antique white")
lab3.place(x=8, y=100)
r3=Radiobutton(root,text="Good", font=("calibri",12), variable=mood_selected, value=3,bg="antique white").place(x=110,y=102)
r4=Radiobutton(root,text="Bad",font=("calibri",12), variable=mood_selected, value=4,bg="antique white").place(x=170,y=102)
lab4 = Label(root, text="Work", font=("calibri", 14, "bold"),bg="antique white")
lab4.place(x=8, y=150)
r5=Radiobutton(root,text="Good", font=("calibri",12), variable=work_selected, value=5,bg="antique white").place(x=110,y=152)
r6=Radiobutton(root,text="Bad",font=("calibri",12), variable=work_selected, value=6,bg="antique white").place(x=170,y=152)

sub_bt=Button(root, text="Submit",font=("calibri",12, "bold"), command=done, bg="brown", fg="white").pack(side=BOTTOM)

root.mainloop()

Answer 1

you can use an if statement to see if it is empty then do what you want, you can change the text on labels to tell the user. then do

root.after(1000, lambda: lab2.config(text=somethingsomething))

to go back to original text... well radio buttons only have 2 options, on and off, so 2nd option is always selected if the user does not touch it.