python - Tkinter crashes when clicking a button and remains pressed

Question

I have a simple program with start and exit buttons. The start button makes a notification using win10toast, but the button remains visibly pressed down and the window becomes unresponsive. The exit button works fine before the start button is pressed. Here's my code:

from tkinter import *
from win10toast import ToastNotifier


root = Tk()


def exit_p():
    exit()

def new():
    hr.show_toast("New", "Alert")
    return


#creates a label widget
myLabel1 = Label(root, text="Full Moon Notification!")
myLabel2 = Label(root, text="Here you can start and exit the program")

button1 = Button(root, text="Start",padx=50,command=new).grid(row=3,column=0)
button2 = Button(root, text="Exit", padx=50,command=exit_p).grid(row=4,column=0)


#puts the widget on the screen
myLabel1.grid(row=0,column=0)
myLabel2.grid(row=1,column=0)

#loop to keep program running
root.mainloop()

Answer 1

The issue is likely because hr.show_toast("New", "Alert") blocks.

The win10toast library conveniently provides an option threaded=True, so just change that code to

hr.show_toast("New", "Alert", threaded=True)

should make it work.