from tkinter import *
tk = Tk()
tk.title('Простой калькулятор')
tk.resizable(0,0)
calculator_entry = Entry(tk, font = ('arial', 20, 'bold'), justify = 'right', width = 32, bd = 3)
calculator_entry.grid(row = 0, column = 0, columnspan = 6)
calculator_entry.insert(0, '0')
bttn_list = [
    '7', '8', '9', '+', '-', '±',
    '4', '5', '6', '*', '÷', 'π',
    '1', '2', '3', 'x²', '√', '⌫',
    'C', '0', '.', '(', ')', '=',
]
r = 1
c = 0
for i in bttn_list:
    btn = Button(tk, font = ('arial', 15, 'bold'), width = 6, height = 3, text = i).grid(row = r, column = c)
    c += 1
    if c>5:
        c = 0
        r += 1
tk.mainloop()