Python tkinter variable

Hey,
ich brauche Hilfe, dabei die Felder (feld1, feld2 ...) mit einem [index] zusammen zufassen.
Damit ich eben nicht alles einzeln aufschreiben muss.

Thanks!



import tkinter as tk
from tkinter import *

modul = tk.Tk()
modul.geometry("900x900")
modul.title("Bunt3x3")
modul.resizable(width=False, height=False)


r = "red"
y = "yellow"
g = "green"
b = "blue"
def change():
    if feld1["bg"] == r:
        feld1.config(bg=g)
        feld3.config(bg=g)
        feld5.config(bg=g)
        feld7.config(bg=g)

        feld2.config(bg=b)
        feld4.config(bg=b)
        feld6.config(bg=b)
        feld8.config(bg=b)

        feldlabel.config(text="Rot & gelb")
    elif feld1["bg"] == g:
        feld1.config(bg=r)
        feld3.config(bg=r)
        feld5.config(bg=r)
        feld7.config(bg=r)

        feld2.config(bg=y)
        feld4.config(bg=y)
        feld6.config(bg=y)
        feld8.config(bg=y)

        feldlabel.config(text="Gruen & blau")

feld1 = tk.Frame(bg =r, width = 300, height = 300)
feld1.grid(column=1, row = 1)
feld3 = tk.Frame(bg =r, width = 300, height = 300)
feld3.grid(column=3, row = 1)
feld5 = tk.Frame(bg =r, width = 300, height = 300)
feld5.grid(column=1, row = 3)
feld7 = tk.Frame(bg =r, width = 300, height = 300)
feld7.grid(column=3, row = 3)
feld2 = tk.Frame(bg =y, width = 300, height = 300)
feld2.grid(column=2, row = 1)
feld4 = tk.Frame(bg =y, width = 300, height = 300)
feld4.grid(column=1, row = 2)
feld6 = tk.Frame(bg =y, width = 300, height = 300)
feld6.grid(column=3, row = 2)
feld8 = tk.Frame(bg =y, width = 300, height = 300)
feld8.grid(column=2, row = 3)

feld = tk.Frame(bg = "white", width = 300, height = 300).grid(column = 2, row=2)
feldlabel = tk.Label(text = "Gruen & blau",bg = "white", fg = "black", font=("Arial",15,"bold"))
feldlabel.grid(column=2,row=2)
feldbutton = tk.Button(text = "Farbe aendern!", font=("Arial",15,"bold"), bg = "white", fg = "black", command = change).place(x = 370, y = 470)
modul.mainloop()