AttributeError: 'NoneType' object has no attribute 'get'

Sample program:

import tkinter as tk

master = tk.Tk()

tk.Label(master, text="First Number").grid(row=0, column=0)

tk.Label(master, text="Second Number").grid(row=1, column=0)

tk.Label(master, text="Value").grid(row=2, column=0)

# Display entry fields

e1 = tk.Entry(master).grid(row=0, column=1) 

e2 = tk.Entry(master).grid(row=1, column=1)

def display():

            a=int(e1.get())

            b=int(e2.get())

            tot=a=b

            tk.Label(master, text=str(tot)).grid(row=2, column=1)       

# end of display function

# button to display all the calculated total 

button1=tk.Button(master, text="Submit", bg="green", command=display)

button1.grid(row=6, column=1)

master.mainloop()

Output:

Error:

1. Exception in Tkinter callback
   Traceback (most recent call last):
     File "C:\Users\KUMAR\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 1883,
    in __call__
       return self.func(*args)
     File "C:/Users/KUMAR/AppData/Local/Programs/Python/Python38-32/myprgm/rough.py", line 10,
    in display
       a=int(e1.get())
   AttributeError: 'NoneType' object has no attribute 'get'.

Problem:

•  None Type means, You got no value. It means an assignment or function call up failed.

Solution:

•  If the entry field contains some calculation, then entry field declaration and place value must be separate.

e1 = tk.Entry(master)

e2 = tk.Entry(master)

e1.grid(row=0, column=1) 

e2.grid(row=1, column=1) 

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