[Python] Python Turtle Window on Top

When I run the code below using Idle for Python 3.6, the turtle screen appears underneath the Idle screens, which is very unsatisfying.

If I omit the input request for the background colour and just use wn.bgcolor("blue") the window appears at the front, as I want.

I've looked at the docs and found turtle.setup(width=_CFG["width"], height=_CFG["height"], startx=_CFG["leftright"], starty=_CFG["topbottom"]) but there doesn't appear to be any kind of z-index parameter.

Any suggestions please?

import turtle

bg_colour = input("Enter the desired background colour: ")
wn = turtle.Screen()
wn.bgcolor(bg_colour) # Set the window background color
wn.title("Hello, Tess!") # Set the window title

tess = turtle.Turtle()
tess.color("blue") # Tell tess to change her color
tess.pensize(3) # Tell tess to set her pen width

tess.forward(50)
tess.left(120)
tess.forward(50)

wn.mainloop()

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