[Python] How to bind several key presses together in turtle graphics?

I'm trying to make a connect-the-dot python game. I want the game to register 2 button presses. Example: if the user presses Up and Right arrow key, the turtle goes 45 degrees north east.

here is my code:

import turtle

flynn=turtle.Turtle()
win=turtle.Screen()
win.bgcolor("LightBlue")
flynn.pensize(7)
flynn.pencolor("lightBlue")

win.listen()

def Up():
flynn.setheading(90)
flynn.forward(25)

def Down():
flynn.setheading(270)
flynn.forward(20)

def Left():
flynn.setheading(180)
flynn.forward(20)

def Right():
flynn.setheading(0)
flynn.forward(20)

def upright():
flynn.setheading(45)
flynn.forward(20)

win.onkey(Up, "Up")
win.onkey(Down,"Down")
win.onkey(Left,"Left")
win.onkey(Right,"Right")

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