How to create a rotate square using python code?

Code:
from turtle import Turtle,Screen

BASE_UNIT=20

def draw(turtle,start,stop,step):
for i in range(start,stop+1,step):
for y in range(start,stop+1,step):

square=Turtle(shape="square")

draw(square,-12,12,12)

tess=Turtle(shape="square")
draw(tess,-6,6,12)
screen=Screen()

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