Calculator.py

from tkinter import *


def yaz(x):
    s = len(giris.get())
    giris.insert(s,str(x))
    #print(x)

hesap = 5
s1 = 0

def islemler(x):
    global hesap
    hesap = x
    global s1
    s1 = float(giris.get())
    print(hesap)
    print(s1)
    giris.delete(0,'end')

s2 = 0
def hesapla():
    global s2
    s2 =float(giris.get())
    print(s2)
    global hesap 
    sonuc = 0
    if(hesap==0):
        sonuc = s1 + s2
    elif(hesap==1):
        sonuc = s1 - s2
    elif(hesap==2):
        sonuc = s1 * s2
    elif(hesap==3):
        sonuc = s1 / s2
    giris.delete(0,'end')
    giris.insert(0,str(sonuc))


pencere = Tk()

pencere.geometry("250x300")

giris = Entry(font="Verdana 14 bold",width=15,justify=RIGHT)
giris.place(x=20,y=20)

b = []

for i in range(1,10):
    b.append(Button(text=str(i),font="Verdana 14 bold",command=lambda x=i:yaz(x)))

sayac = 0

for i in range(0,3):
    for j in range(0,3):
        b[sayac].place(x=20+j*50,y=50+i*50)
        sayac += 1

islem = []

for i in range(0,4):
    islem.append(Button(font="VVerdana 14 bold",width=2,command=lambda x=i:islemler(x)))

islem[0]['text']="+"
islem[1]['text']="-"
islem[2]['text']="*"
islem[3]['text']="/"


for i in range(0,4):
    islem[i].place(x=170,y=50+50*i)

sb = Button(text="0",font="Verdana 14 bold",command=lambda x=0:yaz(x))
sb.place(x=20,y=200)

nb = Button(text=".",font="Verdana 14 bold",width=2,command=lambda x=".":yaz(x))
nb.place(x=70,y=200)

eb = Button(text="=",fg="RED",font="Verdana 14 bold",command=hesapla)
eb.place(x=120,y=200)


pencere.mainloop()