How to restart tkinter/python program on click of a button?
Not an expert myself but fiddled with TKinter some time ago. From what I know the only way to restart a TKinter app is by running it in a thread and then killing and restarting that thread. I would recommend you to take a look at Python's multiprocessing or threading module.
Something you could also try (which worked for me in that past, but isn't really the correct way of doing this I suppose) is to have ROOT = Tk()as a global variable, then having your submit-button as a stand-alone class and have it import global ROOT before executing ROOT.Destroy() and then have it call the application class again, which can also call the global variable (which would cause it to start again). It's a method I've used to have the TKinter window update while I was using it. But the threading method is often mentioned as the proper way of doing this as far as I know..
As a very limited example (short on time for a more extensive one), I did something like this in my old script:
ROOT_WINDOW = ""VARIABLE1 = 'some variable here'def func1(): global ROOT_WINDOW global VARIABLE1 ROOT_WINDOW = Tk() #(Insert application code that uses or requires variable1) func2()def func2(): global ROOT_WINDOW global VARIABLE1 ROOT_WINDOW.Destroy() Change variable1 func1() With regard to setting a maximum number of login attempts. I solved this by creating a separate startup script. It works correctly but I dare not to post it here as it is a real ugly and incorrect way of solving the problem that also comes with a security issue (of having to store your sudo password within a variable).
Sorry for not being able to be of more help.
First of all I would change the bind to return to the root window instead of the entry (otherwise you have to click on the entry field for the return to have an effect)
Next you need 3 state variables for your class.
self.button1 = Noneself.button2 = Noneself.attempts = 0Then by checking the state of each you can accomplish (what I think) you want
Here’s the whole code modified
from tkinter import *class Application(object): def __init__(self, event=None): self.root = Tk() self.root.configure(bg="darkorchid1", padx=10, pady=10) self.root.title("WELCOME") self.username = "Bob" self.welcome = Label(self.root, text="WELCOME TO MY PROGRAM", bg="lightgrey", fg="darkorchid1") self.welcome.pack() self.label0 = Label(self.root, text="ENTER NAME:", bg="purple", fg="white", height=5, width=50) self.label0.pack() self.entry = Entry(self.root, width=25) self.entry.configure(fg= "white",bg="grey20") self.entry.pack() self.root.bind("<Return>", self.submit) self.button = Button(self.root, text="SUBMIT", highlightbackground="green", width=48, command=self.submit) self.button.pack() self.button1 = None self.button2 = None self.attempts = 0 def submit(self, event=None): username = self.entry.get() if username == self.username: if (self.button2 != None): # after I added disabling the submit button this check might not be necessary return if (self.button1 == None): self.button1 = Button(self.root, text='LOGIN', highlightbackground="green", width=28, command=self.root.destroy) self.button1.pack() self.root.bind("<Return>", self.login) self.button.config(state="disabled") else: if (self.button2 == None): self.button2 = Button(self.root, text="INCORRECT- CLICK TO DIMISS THIS MESSAGE", highlightbackground="red", width=48, command=self.incorrect) self.button2.pack() self.root.bind("<Return>", self.incorrect) self.button.config(state="disabled") def incorrect(self, event=None): self.attempts += 1 if (self.attempts > 2): self.root.destroy() else: self.root.bind("<Return>", self.submit) self.button.config(state="normal") self.button2.destroy() self.button2 = None def login(self, event=None): self.root.destroy()app=Application()mainloop()