'"type object argument after * must be an iterable, not int" When trying to increase x and ycor with turtle

I am using turtle graphics in Python to make a game. I want to use these functions to make the spaceship (represented by a turtle) move left and right:

def moveL():
    newpos = f.xcor() - 20
    f.goto(newpos)
def moveR():
    newpos = f.xcor() + 20
    f.goto(newpos)

(Here, f is the turtle instance, representing a fighter ship.) But I keep getting that error in the title. I tried putting both xcor's into parenthesis and putting "iter" before them, but that didn't fix it. Any help is appreciated.

python

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'"type object argument after * must be an iterable, not int" When trying to increase x and ycor with turtle

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