Use Python3 's tkinter to make a simple calculator interface

1#!/usr/bin/python32#-*-coding:utf-8-*-3ImportTkinter4ImportTkinter.font5 6classCalculate ():7def __init__(self):8 self.tk=Tkinter. Tk (); 9 Self.tk.title ("Calculate");1011self.tk.resizable (0,0);Self.showfont=tkinter.font.font (self.tk,size=26);Self.sysfont=tkinter.font.font (self.tk,size=16);1415 Self.entry=tkinter. Entry (Self.tk,width=20,font=self.showfont,bac kground="#ffffff");Self.entry.grid (row=0,column=0,columnspan=4,pady=10);1718 Self.btn1=tkinter. Button (self.tk,text="1", font=Self.sysfont);Self.btn1.grid (Row=1,column=0,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);2021 Self.btn2=tkinter. Button (self.tk,text="2", font=Self.sysfont);Self.btn2.grid (Row=1,column=1,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);2324 Self.btn3=tkinter. Button (self.tk,text="3", font=Self.sysfont);Self.btn3.grid (Row=1,column=2,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);2627 Self.btn_divide=tkinter. Button (self.tk,text="÷", font=Self.sysfon t);Self.btn_divide.grid (Row=1,column=3,sticky=tkinter. N+tkinter. S+t Kinter. w+Tkinter. E);293031 Self.btn4=tkinter. Button (self.tk,text="4", font=Self.sysfont);Self.btn4.grid (Row=2,column=0,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);3334 Self.btn5=tkinter. Button (self.tk,text="5", font=Self.sysfont);Self.btn5.grid (Row=2,column=1,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);3637 Self.btn6=tkinter. Button (self.tk,text="6", font=Self.sysfont);Self.btn6.grid (Row=2,column=2,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);3940 Self.btn_mult=tkinter. Button (self.tk,text="x", font=Self.sysfont);Self.btn_mult.grid (Row=2,column=3,sticky=tkinter. N+tkinter. S+tki nter. w+Tkinter. E);424344 Self.btn7=tkinter. Button (self.tk,text="7", font=Self.sysfont);Self.btn7.grid (Row=3,column=0,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);4647 Self.btn8=tkinter. Button (self.tk,text="8", font=Self.sysfont);Self.btn8.grid (Row=3,column=1,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);4950 Self.btn9=tkinter. Button (self.tk,text="9", font=Self.sysfont);Wuyi Self.btn9.grid (Row=3,column=2,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);5253 Self.btn_minus=tkinter. Button (self.tk,text="-", font=Self.sysfont);Self.btn_minus.grid (Row=3,column=3,sticky=tkinter. N+tkinter. S+TK Inter. w+Tkinter. E);555657 Self.btn0=tkinter. Button (self.tk,text="0", font=Self.sysfont);Self.btn0.grid (Row=4,column=0,sticky=tkinter. N+tkinter. S+tkinter. w+Tkinter. E);5960 Self.btn_point=tkinter. Button (self.tk,text=".", font=Self.sysfont);Self.btn_point.grid (Row=4,column=1,sticky=tkinter. N+tkinter. S+TK Inter. w+Tkinter. E);6263 Self.btn_es=tkinter. Button (self.tk,text="=", font=Self.sysfont);Self.btn_es.grid (Row=4,column=2,sticky=tkinter. N+tkinter. S+tkint er. w+Tkinter. E);6566 Self.btn_add=tkinter. Button (self.tk,text="+", font=Self.sysfont);Self.btn_add.grid (Row=4,column=3,sticky=tkinter. N+tkinter. S+tkin ter. w+Tkinter. E);6869Self.tk.mainloop ();7071 cal=calculate ();

Use Python3 's tkinter to make a simple calculator interface