Can't invoke "entry" command : application has been destroyed.

Question

How to solve this problem
The code is

from tkinter import *
from math import factorial
import parser

root = Tk()
root.title('Calculator')
root.mainloop()

display = Entry(root)
display.grid(row=1, columnspan=6, sticky=N+E+W+S)

Button(root,text="1", command=lambda :get_variables(1)).grid(row=2,column=0, sticky=N+S+E+W)
Button(root,text=" 2", command=lambda :get_variables(2)).grid(row=2,column=1, sticky=N+S+E+W)
Button(root,text=" 3", command=lambda :get_variables(3)).grid(row=2,column=2, sticky=N+S+E+W)

Button(root,text="4", command=lambda :get_variables(4)).grid(row=3,column=0, sticky=N+S+E+W)
Button(root,text=" 5", command=lambda:get_variables(5)).grid(row=3,column=1, sticky=N+S+E+W)
Button(root,text=" 6", command=lambda :get_variables(6)).grid(row=3,column=2, sticky=N+S+E+W)

Button(root,text="7", command=lambda :get_variables(7)).grid(row=4,column=0, sticky=N+S+E+W)
Button(root,text=" 8", command=lambda :get_variables(8)).grid(row=4,column=1, sticky=N+S+E+W)
Button(root,text=" 9", command= lambda :get

Answer 1

had the same trouble with the same code hahaha, the issue was that root.mainloop() was before the entry command, make sure to put the mainloop in the end of the code, otherwise you are executing the program without all the info