calcluter.py

# Python Calculator

from tkinter import *

root = Tk()
root.geometry("500x500")
root.resizable(0, 0)
root.title('Python Calculator')

expression = ""

input_text = StringVar()

# clear


def btn_clear():
    global expression
    expression = ""
    input_text.set("")

# click


def btn_click(item):
    global expression
    expression = expression + str(item)
    input_text.set(expression)

# calculate


def btn_equal():
    global expression
    result = str(eval(expression))
    input_text.set(result)
    expression = ""


# input frame
input_frame = Frame(root, width=312, height=50, bd=0,
                    highlightbackground="black", highlightcolor="black",
                    highlightthickness=2)

input_frame.pack(side=TOP)

# input field inside the frame
input_field = Entry(input_frame, font=('arial', 18, 'bold'),
                    textvariable=input_text, width=50, bg="#eee", bd=0, justify=RIGHT)

input_field.grid(row=0, column=0)

input_field.pack(ipady=10)

# button frame
btns_frame = Frame(root, width=312, height=272.5, bg="grey")

btns_frame.pack()

# first row
clear = Button(btns_frame, text="CLEAR", fg="black", width=32,
               height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
               btn_clear()).grid(row=0, column=0, columnspan=3, padx=1, pady=1)
divide = Button(btns_frame, text="/", fg="black", width=10,
                height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
                btn_click("/")).grid(row=0, column=3, padx=1, pady=1)

# second row
seven = Button(btns_frame, text="7", fg="black", width=10,
               height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
               btn_click(7)).grid(row=1, column=0, padx=1, pady=1)
eight = Button(btns_frame, text="8", fg="black", width=10,
               height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
               btn_click(8)).grid(row=1, column=1, padx=1, pady=1)
nine = Button(btns_frame, text="9", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
              btn_click(9)).grid(row=1, column=2, padx=1, pady=1)
multiply = Button(btns_frame, text="*", fg="black", width=10,
                  height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
                  btn_click("*")).grid(row=1, column=3, padx=1, pady=1)

# third row
four = Button(btns_frame, text="4", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
              btn_click(4)).grid(row=2, column=0, padx=1, pady=1)
five = Button(btns_frame, text="5", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
              btn_click(5)).grid(row=2, column=1, padx=1, pady=1)
six = Button(btns_frame, text="6", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
             btn_click(6)).grid(row=2, column=2, padx=1, pady=1)
minus = Button(btns_frame, text="-", fg="black", width=10,
               height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
               btn_click("-")).grid(row=2, column=3, padx=1, pady=1)

# fourth row
one = Button(btns_frame, text="1", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
             btn_click(1)).grid(row=3, column=0, padx=1, pady=1)
two = Button(btns_frame, text="2", fg="black", width=10, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
             btn_click(2)).grid(row=3, column=1, padx=1, pady=1)
three = Button(btns_frame, text="3", fg="black", width=10,
               height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
               btn_click(3)).grid(row=3, column=2, padx=1, pady=1)
plus = Button(btns_frame, text="+", fg="black", width=10, height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
              btn_click("+")).grid(row=3, column=3, padx=1, pady=1)

# fourth row
zero = Button(btns_frame, text="0", fg="black", width=21, height=3, bd=0, bg="#fff", cursor="hand2", command=lambda:
              btn_click(0)).grid(row=4, column=0, columnspan=2, padx=1, pady=1)
point = Button(btns_frame, text=".", fg="black", width=10,
               height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
               btn_click(".")).grid(row=4, column=2, padx=1, pady=1)
equals = Button(btns_frame, text="=", fg="black", width=10,
                height=3, bd=0, bg="#eee", cursor="hand2", command=lambda:
                btn_equal()).grid(row=4, column=3, padx=1, pady=1)

root.mainloop()