from tkinter import *

def domath():
    a = int((entry1.get()))
    operator = entry2.get()
    b = int((entry3.get()))
    if operator == "-":
        answer.config(text=str(a-b))
    if operator == "*":
        answer.config(text=str(a*b))
    if operator == "/":
        answer.config(text=str(a/b))
    if operator == "+":
        answer.config(text=str(a+b))
    if operator == "**":
        answer.config(text=str(a**b))
    elif( operator != "-") and (operator != "+") and (operator != "*") and (operator != "/") and (operator != "**"):
         answer.config(text="야아 기분좋다!")
    entry1.delete(0, END)
    entry2.delete(0, END)
    entry3.delete(0, END)

def shutdown():
    exit()

root = Tk()
root.title("Idiot Caculator")
root.resizable(False, False)

root.geometry("320x500+0+0")
label1 = Label(root, text="계산기")
label1.pack()
label2 = Label(root, text="숫자")
label2.pack()
entry1 = Entry(root, width=100)
entry1.pack()
label3 = Label(root, text="연산자 (* / - + **) 5가지 중 하나 선택")
label3.pack()
entry2 = Entry(root, width=100)
entry2.pack()
label4 = Label(root, text="숫자")
label4.pack()
entry3 = Entry(root, width=100)
entry3.pack()

btn1 = Button(root, text="계산", command=domath)
btn1.pack()

answer = Label(root, text="결과")
answer.pack()

btn1 = Button(root, text="종료", command=shutdown)
btn1.pack()

root.mainloop()


구글링 하면서 만듬 

- dc official App