Key event seems stuck using `turtle.onkey(function(), "key")`

Question

I'm trying to add keyboard input to move python's turtles but without even pressing the assigned key the turtle moves as if I'm holding the assigned key.

What am I doing wrong?

My code is below:

# import
import turtle

# init screen, turtle
window = turtle.Screen()
turt = turtle.Turtle()
turt.speed(5)

def up():
    turt.forward(10)
def left():
    turt.left(10)
def right():
    turt.right(10)

while True==True:
    turtle.onkey(up(), "Up")
    turtle.onkey(left(), "Left")
    #turtle.onkey(right(), "Right")

# window await
turtle.listen()
window.mainloop()

Answer 1

Rather than calling screen.onkey(function(), "key") you call screen.onkey(funtion, "key")

So

turtle.onkey(up(), "Up")

becomes

turtle.onkey(up, "Up")