# first_square.py

# This is a comment.
# Everything after # is a "comment" and is not run as code.
# Use comments to make notes to yourself about your code.

from turtle import *

pensize(4)  # Make the lines thicker than normal.

forward(200)  # Move the turtle forward 200 steps.
left(90)  # Turn the turtle left by 90 degrees.

# Move forward and turn three more times:
forward(200)
left(90)
forward(200)
left(90)
forward(200)
left(90)

done()  # Without this, the Turtle window may immediately close before you can see the picture.