Resistive Divider widget using tkinter in Python

import tkinter as tk

from functools import partial

#from builtins import None

Font_tuple = ("Comic Sans MS", 10, "bold")

def button_click(display9_value,V, R1, R2):

    #display = tk.Label(root, text="Calculating",fg = "Dark Green").place(x = 165, y = 220)

    X = V.get()

    Y = R1.get()

    Z = R2.get()

    Voltage = (float(X)*float(Z))/(float(Y)+float(Z))

    if ((Voltage is None) or (X is None) or (Y is None) or (Z is None)):

      display = tk.Label(root, text="Calculation Error",fg = "Red").place(x = 165, y = 220)

    else:

        display = tk.Label(root, text="Calculation Successful",fg = "Dark Green").place(x = 165, y = 220)

    display9_value.config(text="%f Volts" %Voltage)

    voltage = None 

    X = None

    Y = None

    Z = None 

    return

root = tk.Tk()

root.geometry("525x280")

R1 = tk.StringVar()  

R2 = tk.StringVar()

V = tk.StringVar()

VR2 = tk.StringVar()

logo1 = tk.PhotoImage(file="way2know.gif")

display = tk.Label(root, image=logo1).place(x = 455, y = 190)

logo = tk.PhotoImage(file="VR-image.gif")

display = tk.Label(root, image=logo).place(x = 320, y = 25)

display = tk.Label(root, text="Voltage with Resistive Divider", fg = "Blue",font = Font_tuple).place(x = 40, y = 20)

display1 = tk.Label(root, text="Resistor - R1").place(x = 40, y = 60)

display2 = tk.Entry(root,textvariable=R1).place(x = 175, y = 60)

display3 = tk.Label(root, text="Resistor - R2").place(x = 40, y = 100)

display4 = tk.Entry(root,textvariable=R2).place(x = 175, y = 100)

display5 = tk.Label(root, text="Voltage Rail - +V").place(x = 40, y = 140)

display6 = tk.Entry(root,textvariable=V).place(x = 175, y = 140)

display7 = tk.Label(root, text="Voltage across R2 (VR2)")

display7.place(x = 40, y = 180)

#display8 = tk.Entry(root,textvariable=VR2)

#display8.place(x = 175, y = 180)

display9 = tk.Label(root, text="To be calculated",fg = "Blue")

display9.place(x = 175, y = 180)

button_click = partial(button_click, display9, V, R1, R2)

display = tk.Button(root,text = "Calculate", command=button_click).place(x = 40,y = 220)

root.mainloop()

Below is the output screen for the above program:

Access below video for description of the code: