# Arup Guha
# 10/7/2020
# Solution to Midterm Exam Part B Problem 3: Turtle Highway

import turtle

# Draw top line.
turtle.penup()
turtle.setpos(-300, 50)
turtle.pendown()
turtle.forward(550)

# Draw bottom line.
turtle.penup()
turtle.setpos(-300, -50)
turtle.pendown()
turtle.forward(550)

# Get ready for middle line.
turtle.penup()
turtle.setpos(-300, 0)

# We have 11 segments of size 50 to draw.
for i in range(11):

    # Even numbered segments are drawn with the pen.
    if i%2 == 0:
        turtle.pendown()

    # Odd ones are not.
    else:
        turtle.penup()

    # Move!
    turtle.forward(50)