tkinter multiple radio buttons - python-3.x

Question

I have 2 sets of radio buttons to be selected, if I select one of the second set, the selected button in the first set will be de-selected, although the related function is still working.
Here is the example and code
For “Need Specific Number?” (radio 1 and radio 2) and “Want to Send email with different email address?”(radio 5 and radio 6), I can only select 1 of them. for example, if I select radio 1, then select radio 5 or radio 6, radio 1 is de-selected. I am not sure where I did wrong.
Could you kindly point out the correct way?
Here is my code
from tkinter import *
from tkinter import messagebox
from tkinter.ttk import *
root = Tk()
def guiUDP():
def enableSPNum() :
entry5.configure(state = 'normal')
def disableSPNum() :
entry5.configure(state = 'disabled')
def diffEmail() :
entry8.configure(state = 'normal')
def defaultEmail() :
entry8.configure(state = 'disabled')
def submitReq() :
userID = entry1.get()
siteCode = entry2.get().upper()
firstName = entry3.get().title()
lastName = entry4.get().upper()
spNum = entry5.get()
vmEnable = select1.get()
agentID = entry7.get().lower()
eMail = entry8.get()
entry1 = Entry(root)
entry1.grid(column = 1, row = 0)
label1 = Label(root, text = 'userID : ')
label1.grid(column = 0, row = 0, sticky = E)
entry2 = Entry(root)
entry2.grid(column = 1, row = 1)
label2 = Label(root, text = 'Site Code :')
label2.grid(column = 0, row = 1, sticky = E)
entry3 = Entry(root)
entry3.grid(column = 1, row = 2)
label3 = Label(root, text = 'First Name :')
label3.grid(column = 0, row = 2, sticky = E)
entry4 = Entry(root)
entry4.grid(column = 1, row = 3)
label4 = Label(root, text = 'Last Name :')
label4.grid(column = 0, row = 3, sticky = E)
#selected = IntVar()
label5 = Label(root, text = 'Need Specific Number? :')
label5.grid(column = 0, row = 4, sticky = E)
rad1 = Radiobutton(root,text='Yes', value = 1, command = enableSPNum)
rad2 = Radiobutton(root,text='No (Default)', value = 2, command = disableSPNum)
rad1.grid(column = 1, row = 4)
rad2.grid(column = 2, row = 4)
entry5 = Entry(root, state = 'disabled')
entry5.grid(column = 1, row = 6)
label6 = Label(root, text = 'Extension :')
label6.grid(column = 0, row = 6, sticky = E)
label7 = Label(root, text = 'Voicemail Required? :')
label7.grid(column = 0, row = 7, sticky = E)
select1 = IntVar()
rad3 = Radiobutton(root,text='Yes', value = 3, variable = select1)
rad4 = Radiobutton(root,text='No', value = 4, variable=select1)
rad3.grid(column = 1, row = 7)
rad4.grid(column = 2, row = 7)
entry7 = Entry(root)
entry7.grid(column = 1, row = 8)
label8 = Label(root, text = 'Your userID :')
label8.grid(column = 0, row = 8, sticky = E)
label9 = Label(root, text = 'Want to send email with differnt email adrress? :')
label9.grid(column = 0, row = 9, sticky = E)
#selected = IntVar()
rad5 = Radiobutton(root,text='Yes', value = 5, command = diffEmail)
rad6 = Radiobutton(root,text='No', value = 6, command = defaultEmail)
rad5.grid(column = 1, row = 9)
rad6.grid(column = 2, row = 9)
entry8 = Entry(root, state = 'disabled')
entry8.grid(column = 1, row = 10)
label10 = Label(root, text = 'Full Email Address :')
label10.grid(column = 0, row = 10, sticky = E)
btn = Button(root, text = 'Submit', command = submitReq)
btn.grid(column = 2, row = 20)
mainMenu = Menu(root)
root.configure(menu=mainMenu)
guiMenu = Menu(mainMenu, tearoff = 0)
mainMenu.add_cascade(label = 'TEST', menu=guiMenu)
guiMenu.add_command(label = 'TEST', command = guiUDP)
root.mainloop()
root.geometry('600x600')

Answer 1

You have not assigned a variable to the first and third row of radiobuttons. If I interrogate the radiobuttons without a variable they say they are bound to selectedButton, which is the same for all of them. I'm guessing this is some kind of default behaviour when variable is missing. If you create a variable for each of the rows of associated radiobuttons and assign it to them, the effect goes away.