tkinter project

from tkinter import *

def get():
    if len(e1.get()) == 0 or len(e2.get()) == 0:
        errorL = Label(w, text = "Fill in the entries.", fg = "red")
        errorL.grid(row = 2)
    else:
        pass

    firstNum = float(e1.get())
    secondNum = float(e2.get())
    answer = firstNum + secondNum
    answerText = Label(w, text = answer, fg = "green")
    answerText.grid(row = 3, column = 1, sticky = "w")

w = Tk()
w.geometry("450x400")
w.title("Application")

e1 = Entry(w)
e2 = Entry(w)
b1 = Button(w, text="Add", command = get)
t1 = Label(w, text="First number: ")
t2 = Label(w, text="Second number: ")
helpText = Label(w, text = "Answer: ")

t1.grid(row = 0, column = 0)
e1.grid(row = 0, column = 1, sticky = "w")
t2.grid(row = 0, column = 2)
e2.grid(row = 0, column = 3)
b1.grid(row = 1, column = 0, sticky = "w")
helpText.grid(row = 3, sticky = "w")

w.mainloop()