text: from Tix import Tk, Entry, Button, StringVar
  
  from _tkinter import *
  screen = Tk()
  
  screen.title('ESHUN STATISTICS CALCULATOR')
  screen.geometry('360x490')
  def click(number):
      global operator
      operator += str(number)
      tex.set(operator)
  
  tex = StringVar()
  operator=''
  
  def AC():
      global operator
      operator= ''
      tex.set(operator)
  
  def equal():
      global operator
      result = eval(operator)
      operator= str(result)
      tex.set(result)
      ###### work for all
  def on_enter(e):
      btn7.configure(bg='red')
  def on_leave(e):
      btn7.configure(bg='white')
  
  
  
  
  
  
  
  def on_entryenter(e):
      btn7.configure(bg='red')
  def on_entryleave(e):
      btn7.configure(bg='white')
  
  
  
  
  
  
  
  entry1 = Entry(screen, bg='green', font=('yellow', 20, 'italic bold'),bd='20',justify='left',textvariable=tex)
  entry1.grid(row=0, columnspan=4)
  
  
  btn7 = Button(screen,text=' 7',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(7),
                activebackground='pink',activeforeground='blue',bg='powder blue' )
  btn7.grid(row=1,column=0)
  btn7.bind('<Enter>',on_enter)
  btn7.bind('<Leave>',on_leave)
  
  btn8=Button(screen, text='8', font=('yellow', 15, 'italic bold'), bd=8, padx=15, pady=15, command=lambda:click(8) )
  btn8.grid(row=1,column=1)
  
  btn9=Button(screen,text=' 9',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(9))
  btn9.grid(row=1,column=2)
  
  btnadd=Button(screen,text='+',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click('+'))
  btnadd.grid(row=1,column=3)
  
  btn4 = Button(screen,text='4',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(4))
  btn4.grid(row=2,column=0)
  
  btn5=Button(screen,text='5',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(5))
  btn5.grid(row=2,column=1)
  
  btn6=Button(screen,text='6',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(6))
  btn6.grid(row=2,column=2)
  
  btnsub=Button(screen,text='-',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click('-'))
  btnsub.grid(row=2,column=3)
  
  
  btn1 = Button(screen,text='1',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(1))
  btn1.grid(row=3,column=0)
  
  btn2=Button(screen,text='2',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(2))
  btn2.grid(row=3,column=1)
  
  btn3=Button(screen,text='3',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(3))
  btn3.grid(row=3,column=2)
  
  btnmul=Button(screen,text='x',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click('*'))
  btnmul.grid(row=3,column=3)
  
  
  btn0 = Button(screen,text='0',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click(0))
  btn0.grid(row=4,column=0)
  
  btnAC=Button(screen,text='AC',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=AC)
  btnAC.grid(row=4,column=1)
  
  btnequal=Button(screen,text='=',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=equal)
  btnequal.grid(row=4,column=2)
  
  btndiv=Button(screen,text='/',font=('yellow',15,'italic bold'),bd=8,padx=15,pady=15,command=lambda:click('/'))
  btndiv.grid(row=4,column=3)
  
  
  
  screen.mainloop()
  ###################################### work for all
  entry1.bind('<Enter>',on_entryenter)
  entry1.bind('<Enter>',on_entryleave)
  
  btn7.bind('<Enter>',on_enter)
  btn7.bind('<Enter>',on_leave)
  ## others here