from tkinter import*
tk=Tk()
tk.geometry("260x350")
def btn_click():
        ent.insert(END,"7")
def b1_click():
        ent.delete(0, END)
def btn1_click():
        ent.insert(END,"8")
def btn2_click():
        ent.insert(END,"9")
def btn3_click():
        ent.insert(END,"6")
def btn4_click():
        ent.insert(END,"5")
def btn5_click():
        ent.insert(END,"4")
def btn6_click():
        ent.insert(END,"3")
def btn7_click():
        ent.insert(END,"2")
def btn8_click():
        ent.insert(END,"1")
def btn9_click():
        ent.insert(END,"0")
def btn10_click():
        ent.insert(END,".")
def btn11_click():
        ent.insert(END,"/")
def btn12_click():
        ent.insert(END,"*")
def btn13_click():
        ent.insert(END,"-")
def btn14_click():
        ent.insert(END,"+")
ent=Entry(justify="right", font="14")
ent.place(x=20,y=20, width=220, height=30)
BC=Button(text="C", font="14", command=b1_click)
BC.place(x=20,y=70,width=100,height=40)
Equal=Button(text="=", font="14")
Equal.place(x=140,y=70,width=100,height=40)
B7=Button(text="7", font="14", command=btn_click)
B7.place(x=20,y=130, width=40, height=40)
B8=Button(text="8", font="14", command=btn1_click)
B8.place(x=80,y=130, width=40, height=40)
B9=Button(text="9", font="14", command=btn2_click)
B9.place(x=140,y=130, width=40, height=40)
B6=Button(text="6", font="14", command=btn3_click)
B6.place(x=140,y=180, width=40, height=40)
B5=Button(text="5", font="14", command=btn4_click)
B5.place(x=80,y=180, width=40, height=40)
B4=Button(text="4", font="14", command=btn5_click)
B4.place(x=20,y=180, width=40, height=40)
B3=Button(text="3", font="14", command=btn6_click)
B3.place(x=140,y=230, width=40, height=40)
B2=Button(text="2", font="14", command=btn7_click)
B2.place(x=80,y=230, width=40, height=40)
B1=Button(text="1", font="14", command=btn8_click)
B1.place(x=20,y=230, width=40, height=40)
B0=Button(text="0", font="14", command=btn9_click)
B0.place(x=20,y=280, width=100, height=40)
B=Button(text=".", font="14", command=btn10_click)
B.place(x=140,y=280, width=40, height=40)
B11=Button(text="/", font="14", command=btn11_click)
B11.place(x=200,y=130, width=40, height=40)
B12=Button(text="*", font="14", command=btn12_click)
B12.place(x=200,y=180, width=40, height=40)
B13=Button(text="-", font="14", command=btn13_click)
B13.place(x=200,y=230, width=40, height=40)
B13=Button(text="+", font="14", command=btn14_click)
B13.place(x=200,y=280, width=40, height=40)