maybe_a_rat_fucker

from tkinter import *
from tkinter import ttk

time_list = []

def time_set(x):
    #main presets
    root=Tk()
    root.title('timer')
    root.geometry('400x200+1515+850')
    root.resizable(False, False)

    #icon
    icon=PhotoImage(file = "timer.png")
    root.iconphoto(True, icon)

    #fields for user time
    entry_hour=ttk.Entry()
    entry_minute=ttk.Entry()
    entry_second=ttk.Entry()
    entry_hour.pack()
    entry_minute.pack()
    entry_second.pack()

    def close_window():
        root.destroy()

    def set():
        global time_list
        time_list = [entry_hour.get(), entry_minute.get(), entry_second.get()]

    #button for preset
    button_set = ttk.Button(text='Set', command=set)
    button_set.pack(anchor=W)
    #button for start
    button_start=ttk.Button(text='Start',command=close_window)
    button_start.pack(anchor=E)

    root.mainloop()

time_set(True)
print(time_list)