tkinter

from tkinter import *
root = Tk() #window
root.title("Calculator")

en = Entry(root, width=50, borderwidth=10)
en.grid(row=0,column=0,columnspan=3,padx=10,pady=10)

def bt_a():
	return

bt=Button(root,text="0",padx=30,pady=10,command=bt_a).grid(row=4,column=0)
bt1=Button(root,text="1",padx=30,pady=10,command=bt_a).grid(row=3,column=0)
bt2=Button(root,text="2",padx=30,pady=10,command=bt_a).grid(row=3,column=1)
bt3=Button(root,text="3",padx=30,pady=10,command=bt_a).grid(row=3,column=2)
bt4=Button(root,text="4",padx=30,pady=10,command=bt_a).grid(row=2,column=0)
bt5=Button(root,text="5",padx=30,pady=10,command=bt_a).grid(row=2,column=1)
bt6=Button(root,text="6",padx=30,pady=10,command=bt_a).grid(row=2,column=2)
bt7=Button(root,text="7",padx=30,pady=10,command=bt_a).grid(row=1,column=0)
bt8=Button(root,text="8",padx=30,pady=10,command=bt_a).grid(row=1,column=1)
bt9=Button(root,text="9",padx=30,pady=10,command=bt_a).grid(row=1,column=2)





my_label = Label(root,text="Hello World!") #creating label


#printing on screen
# my_label.pack()

root.mainloop()