Python Calculator

As an exercise in order to improve my python skills for the past holidays I have decided to learn another module, “tkinter”. “Tkinter” allows you to work with graphical interfaces which is something that I am very interested in doing for future projects. I have started to make a Sign up system for which I have done the login part so far and I have done a calculator that has the following code:

#We import everything from "tkinter".

from tkinter import *

#We create the variable for letting code now it is working with "tkinter".

root = Tk()
root.title("Simple Calculator")

#We create the entry were we will be seeing the numbers.

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

#We proceed to create the functions that we will be assigning to numbers.

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 = int(first_number)
    e.delete(0, END)


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


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


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


def button_equal():
    second_number = e.get()
    e.delete(0, END)
    if math == "addition":
        e.insert(0, f_num + int(second_number))
    elif math == "subtraction":
        e.insert(0, f_num - int(second_number))
    elif math == "multiplication":
        e.insert(0, f_num * int(second_number))
    elif math == "division":
        e.insert(0, f_num / int(second_number))

#Now we create the buttons and assign them to the previously created functions with lambda if #we want the buttons to pass numbers or without it if we don't.

Button_1 = Button(root, text="1", padx=40, pady=20, command=lambda: button_click(1))
Button_2 = Button(root, text="2", padx=40, pady=20, command=lambda: button_click(2))
Button_3 = Button(root, text="3", padx=40, pady=20, command=lambda: button_click(3))
Button_4 = Button(root, text="4", padx=40, pady=20, command=lambda: button_click(4))
Button_5 = Button(root, text="5", padx=40, pady=20, command=lambda: button_click(5))
Button_6 = Button(root, text="6", padx=40, pady=20, command=lambda: button_click(6))
Button_7 = Button(root, text="7", padx=40, pady=20, command=lambda: button_click(7))
Button_8 = Button(root, text="8", padx=40, pady=20, command=lambda: button_click(8))
Button_9 = Button(root, text="9", padx=40, pady=20, command=lambda: button_click(9))
Button_0 = Button(root, text="0", padx=40, pady=20, command=lambda: button_click(0))
Button_add = Button(root, text="+", padx=39, pady=20, command=button_add)
Button_equal = Button(root, text="=", padx=99, pady=20, command=button_equal)
Button_clear = Button(root, text="Clear", padx=87, pady=20, command=button_clear)
Button_subtract = Button(root, text="-", padx=40, pady=20, command=button_subtract)
Button_multiply = Button(root, text="*", padx=41, pady=20, command=button_multiply)
Button_divide = Button(root, text="/", padx=42, pady=20, command=button_divide)

#We place the buttons into a grid system in whatever order we like.

Button_1.grid(row=3, column=0)
Button_2.grid(row=3, column=1)
Button_3.grid(row=3, column=2)

Button_4.grid(row=2, column=0)
Button_5.grid(row=2, column=1)
Button_6.grid(row=2, column=2)

Button_7.grid(row=1, column=0)
Button_8.grid(row=1, column=1)
Button_9.grid(row=1, column=2)

Button_0.grid(row=4, column=0)
Button_clear.grid(row=4, column=1, columnspan=2)
Button_add.grid(row=5, column=0)
Button_equal.grid(row=6, column=1, columnspan=2)

Button_subtract.grid(row=6, column=0)
Button_multiply.grid(row=5, column=1)
Button_divide.grid(row=5, column=2)


root.mainloop()