[Python] Why can't I change the color and text of a Tkinter GUI?

I want to create a class for a Tk.Button in a Tk.Frame so that the button can have a border color independent of its background color.

I wrote this code

import tkinter as tk


class FramedButton(tk.Frame):
def __init__(self, parent, text="HELLO", bcolor="red", *args, **kwargs):
tk.Frame.__init__(self, parent, bg="green", *args, **kwargs)
self.parent = parent
self.button=tk.Button(self, text=text, bg=bcolor, borderwidth=1)
self.button.grid(row=0, column=0, padx=5, pady=5)
self.pack()

root = tk.Tk()
root.title="FramedButton"

fb=FramedButton(root)
fb.pack(padx=10,pady=10)

# but these do not work... what do I need to add/change?
fb.text="WORLD"
fb.bg="blue"
fb.bcolor="yellow"

root.mainloop()


The fb.text, fb.bg, and fb.bcolor lines do not work. What do I need to change so that they work?

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