[Python] Getting error with turtle.bgcolor() in Python

I am trying to use turtle to create a square, while tryng to give a color to the turtle window a color "black". I am getting errors, any input will be helpful.

Below is my code:

import turtle

def draw_square():
window = turtle._Screen
window.bgcolor("black")


brad = turtle.Turtle()
brad.forward(100)
window.exitonclick()

draw_square()


Below is what I get in error:

color = self._bgcolor(color)

AttributeError: 'str' object has no attribute '_bgcolor'

Continue reading...