[Python] How to make a rounded button tkinter?

I am trying to get rounded buttons for my script using tkinter.

I found the following code in an answer to How to make a Button using the tkinter Canvas widget?:

from tkinter import *
import tkinter as tk

class CustomButton(tk.Canvas):
def __init__(self, parent, width, height, color, command=None):
tk.Canvas.__init__(self, parent, borderwidth=1,
relief="raised", highlightthickness=0)
self.command = command

padding = 4
id = self.create_oval((padding,padding,
width+padding, height+padding), outline=color, fill=color)
(x0,y0,x1,y1) = self.bbox("all")
width = (x1-x0) + padding
height = (y1-y0) + padding
self.configure(width=width, height=height)
self.bind("<ButtonPress-1>", self._on_press)
self.bind("<ButtonRelease-1>", self._on_release)

def _on_press(self, event):
self.configure(relief="sunken")

def _on_release(self, event):
self.configure(relief="raised")
if self.command is not None:
self.command()
app = CustomButton()
app.mainloop()


but I get the following error:

TypeError: __init__() missing 4 required positional arguments: 'parent', 'width', 'height', and 'color'

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