useless for tkinter

# Python 3

from tkinter import *

app = Tk()
app.title("usefull")
c = [i for i in range(15)]
for i in c:
    Label(text=f"{i}").grid(column=int(f"{i+1}"), row=int(f"{i}"))
    Button(text=f"{i}").grid(column=int(f"{i}"), row=int(f"{i}"))

app.mainloop()