Десятичный в калькуляторе tkinter

Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно. Вот полностью рабочий калькулятор. Для тех, кому это нужно.

 from tkinter import *
from math import *

root = Tk()

root.title("Simple Calculator")

e = Entry(root, width=35, borderwidth=5)
e.grid(row=0, column=0, columnspan=3, padx=10, pady=10)



def button_click(number):
    current = e.get()
    e.delete(0, END)
    e.insert(0, str(current) + str(number))

def button_clear():
    e.delete(0, END)


def button_add():
    first_number = e.get()
    global f_num
    global math
    math = "addition"
    f_num = float(first_number)
    e.delete(0, END)


def button_equal():
    global f_num
    second_number = e.get()
    e.delete(0, END)
    if math == "addition":
        e.insert(0, f_num + float(second_number))
    if math == "subtraction":
        e.insert(0, f_num - float(second_number))
    if math == "multiplication":
        e.insert(0, f_num * float(second_number))
    if math == "division":
        e.insert(0, f_num / float(second_number))
    if math == "comma":
        e.insert(0,f_num +  + float(second_number))
    if math == "squere":
        e.insert(0, f_num ** int(2))
    if math == "sroot":
        e.insert(0, sqrt(f_num) )



def button_subtract():
    first_number = e.get()
    global f_num
    global math
    math = "subtraction"
    f_num = float(first_number)
    e.delete(0, END)



def button_multiply():
    first_number = e.get()
    global f_num
    global math
    math = "multiplication"
    f_num = float(first_number)
    e.delete(0, END)


def button_divide():
    first_number = e.get()
    global f_num
    global math
    math = "division"
    f_num = float(first_number)
    e.delete(0, END)

def button_comma():
    global f_num
    first_number = e.get()
    f_num=str(first_number)
    s_num = e.get()
    e.insert(0, str(f_num) +  str(".")  + str(s_num))

def Button_num(number):
    current=e.get()
    e.delete(0,END)
    e.insert(0,str(current)+ str(number))

def Button_squeree():
    global math
    global f_num
    first_number = e.get()
    f_num = int(first_number)
    math = "squere"
    current=e.get()
    e.delete(0, END)
    e.insert(0,int(current) ^ int(first_number))

def Button_sroott():
    first_number = e.get()
    global f_num
    global math
    math = "sroot"
    f_num = float(first_number)
    e.delete(0, END)



#Sredi zarez!
'''   
def button_comma():
    current = e.get()
    e.insert(0, str(current) + str(","))



Button_comma = Button(root, text = "," ,padx=40,pady=20,command=lambda: button_comma())
Button_comma.grid(row = 7 , column = 0 )
'''


# Definisi tastere
Button1 = Button(root, text = "1", padx=40, pady=20, command=lambda: button_click(1))
Button2 = Button(root, text = "2", padx=40, pady=20, command=lambda: button_click(2))
Button3 = Button(root, text = "3", padx=40, pady=20, command=lambda: button_click(3))

Button4 = Button(root, text = "4", padx=40, pady=20, command=lambda: button_click(4))
Button5 = Button(root, text = "5", padx=40, pady=20, command=lambda: button_click(5))
Button6 = Button(root, text = "6", padx=40, pady=20, command=lambda: button_click(6))

Button7 = Button(root, text = "7", padx=40, pady=20, command=lambda: button_click(7))
Button8 = Button(root, text = "8", padx=40, pady=20, command=lambda: button_click(8))
Button9 = Button(root, text = "9", padx=40, pady=20, command=lambda: button_click(9))

Button0 = Button(root, text = "0", padx=40, pady=20, command=lambda: button_click(0))
Button_add = Button(root, text = "+", padx=38, pady=20, command=button_add)
Button_equal = Button(root, text = " = ", padx=87, pady=20, command=button_equal)

Button_clear = Button(root, text = "Clear", padx=77, pady=20, command=button_clear)
Button_subtract = Button(root, text = "-", padx=40, pady=20, command=button_subtract)
Button_multiply = Button(root, text = "*", padx=40, pady=20, command=button_multiply)

Button_divide = Button(root, text = "/", padx=41, pady=20, command=button_divide)
btn_decimal = Button(root, text=u'\u002E', padx=40, pady=20, command=lambda:Button_num("."))
Button_squere = Button(root,text = "^",padx=40,pady=20,command=Button_squeree)

Button_sroot =  Button(root, text = "r",padx=40, pady=20, command=Button_sroott)
'''
Button_comma = Button(root, text = "." , padx=40 , pady=20 , command=button_comma)
'''

# stavi tastere na ekran
Button1.grid(row=3, column=0)
Button2.grid(row=3, column=1)
Button3.grid(row=3, column=2)

Button4.grid(row=2, column=0)
Button5.grid(row=2, column=1)
Button6.grid(row=2, column=2)

Button7.grid(row=1, column=0)
Button8.grid(row=1, column=1)
Button9.grid(row=1, column=2)

Button0.grid(row=4, column=0)
Button_add.grid(row=5, column=0)
Button_equal.grid(row=5, column=1, columnspan=2)

Button_clear.grid(row=4, column=1, columnspan=2)
Button_subtract.grid(row=6, column=0)
Button_multiply.grid(row=6, column=1)

Button_divide.grid(row=6, column=2)
btn_decimal.grid(row=7,column=0)
Button_squere.grid(row=7,column=1)


Button_sroot.grid(row=7 , column=2)








root.mainloop()