how to get python calculator source code in discription below смотреть онлайн

from tkinter import*

def btnClick(numbers):
global operator
operator=operator + str(numbers)

def btnClearDisplay():
global operator
operator=""
text_Input.set("")

def btnEqualsInput():
global operator
sumup=str(eval(operator))
text_Input.set(sumup)
operator=""


cal = Tk()
cal.title("Caclculator)"
operator=""
text_Input =StringVar()

txtDisplay = Entry(cal,font=('arial', 20,'bold'), textvariable=text_Input, bd=30,
insertwidth=4, bg="powder blue", justify='right').grid(columnspan=4)

btn7=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="7").grid(row=1,column=0)

btn8=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="8").grid(row=1,column=1)

btn9=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="9").grid(row=1,column=2)

Addition=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="+").grid(row=1,column=3)
#===========================================================================================
btn4=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="4").grid(row=2,column=0)

btn5=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="5").grid(row=2,column=1)

btn6=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="4").grid(row=2,column=2)

Substraction=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="-").grid(row=2,column=3)
#==========================================================================================
btn3=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="3").grid(row=3,column=0)

btn2=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="2").grid(row=3,column=1)

btn1=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="1").grid(row=3,column=2)

Multiply=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="3").grid(row=3,column=3)
#========================================================================================
btn0=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="0").grid(row=4,column=0)

btnClear=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="C", bg="powder blue",command= btnClearDisplay).grid(row=4,column=1)

btnEquals=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="=", bg="powder blue",command=btnEqualsInput)).grid(row=4,column=2)

Division=Button(cal,padx=16,bd=8, fg="black",font=('arial',20,'bold'),
text="/").grid(row=4,column=3)
cal.mainloop()