GUI Calculator using python

from tkinter import *

def click(event):

global scrvalue

text = event.widget.cget("text")

if text == "=":

if scrvalue.get().isdigit():

value = int(scrvalue.get())

else:

try:

value = eval(screen.get())

except:

value = "Error!"

scrvalue.set(value)

screen.update()

elif text == "C":

scrvalue.set("")

screen.update()

else:

scrvalue.set(scrvalue.get() + text)

scrvalue.update()

window = Tk()

window.title("Calculator by ./Rakshit")

window.geometry("744x600")

scrvalue = StringVar()

scrvalue.set("")

screen = Entry(window,textvar=scrvalue,font="lucida 40 bold")

screen.pack(fill=X,ipadx=8,padx=10,pady=10)

frame = Frame(window,bg="yellow")

button = Button(frame,text="9",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="8",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="7",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="/",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=16,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="C",padx=21,pady=18,font="lucida 35 bold",bg='red')

button.pack(side=LEFT,padx=16,pady=10)

button.bind("<Button-1>", click)

frame.pack(anchor=W)

frame = Frame(window,bg="yellow")

button = Button(frame,text="6",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="5",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="4",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="*",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=13,pady=10)

button.bind("<Button-1>", click)

frame.pack(anchor=W)

frame = Frame(window,bg="yellow")

button = Button(frame,text="3",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="2",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="1",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="-",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=15,pady=10)

button.bind("<Button-1>", click)

frame.pack(anchor=W)

frame = Frame(window,bg="yellow")

button = Button(frame,text="0",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=10,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text=".",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=18,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="=",padx=21,pady=18,font="lucida 35 bold",bg='green')

button.pack(side=LEFT,padx=5,pady=10)

button.bind("<Button-1>", click)

button = Button(frame,text="+",padx=21,pady=18,font="lucida 35 bold")

button.pack(side=LEFT,padx=6,pady=10)

button.bind("<Button-1>", click)

frame.pack(anchor=W)

window.mainloop()