calculator.py

from tkinter import *

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

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

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

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

def button_add():
    first_num = e.get()
    global f_num
    f_num = int(first_num)
    e.delete(0, END)


def button_equal():
    second_num= e.get()
    e.delete(0, END)
    e.insert(0, f_num + int(second_num))


# defining buttons

button_1= Button(root, text="1", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(1))
button_2= Button(root, text="2", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(2))
button_3= Button(root, text="3", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(3))

button_4= Button(root, text="4", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(4))
button_5= Button(root, text="5", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(5))
button_6= Button(root, text="6", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(6))

button_7= Button(root, text="7", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(7))
button_8= Button(root, text="8", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(8))
button_9= Button(root, text="9", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(9))

button_0= Button(root, text="0", padx=40, pady=20, bg="teal", fg="white", command=lambda: button_click(0))
add= Button(root, text="+", padx=39, pady=20, bg="teal", fg="white", command=button_add)
clear= Button(root, text="Clr", padx=35, pady=20, bg="teal", fg="white", command=button_clear)

equal= Button(root, text="=", padx=143, pady=20, bg="teal", fg="white", command=button_equal)

# button on the screen

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)
add.grid(row=4, column=1)
clear.grid(row=4, column=2)

equal.grid(row=5, column=0, columnspan=3)



root.mainloop()