# solution_octogon.py
from turtle import *
pensize(4)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

left(45)
forward(100)

# Or you can run:
# for i in range(8):
#     left(45)
#     forward(100)
done()