[Python] Turtle graphics using a function

I have this code below and I am trying to draw a colored square. The code works fine. I am curious about one thing though: why can't I define some of the attributes (see those that I commented out)under the function drawColoredSq()? Python doesn't run them if I do this. It only works when I define them after creating the actual turtle (turt in this case) and you can see this in the main() function. Why is this the case? Thank you!!!

import turtle
def drawColoredSq(t, sz):
t.begin_fill()
for side in ("side A", "side B", "side C", "side D"):
t.forward(sz)
t.write(side)
t.left(90)
t.end_fill()
# t.shape("classic")
# t.pensize(3)
# t.pencolor("green")
# t.fillcolor("blue")

def main():

wn = turtle.Screen()
turt = turtle.Turtle()
wn.bgcolor("maroon")
wn.setworldcoordinates(0,0,50,50)
turt.shape("classic")
turt.pensize(3)
turt.pencolor("green")
turt.fillcolor("orange")
drawColoredSq(turt, 49)
wn.exitonclick()
if __name__ == "__main__":
main()

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