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# 2.4.6 4 Columns 2.0 CodeHS Answers

The most common answer is:

``````penup()
backward(200)
for i in range (1):
left(90)
forward(200)
right(90)
forward(100)
left(270)
pendown()
forward(400)
left(90)
penup()
forward(100)
right(270)
pendown()
forward(400)
penup()
right(90)
forward(100)
right(90)
pendown()
forward(400)``````

This code appears to be an attempt to draw 4 vertical columns, but there are several inefficiencies and a bit of redundancy in the way it’s structured. Furthermore, the loop `for i in range (1):` only iterates once, which doesn’t leverage the power of loops for repetitive actions.

Here’s a revised version that simplifies the process and correctly utilizes a loop to draw 4 columns efficiently:

``````import turtle

# Setup turtle
turtle.speed(1)  # Set drawing speed

# Move turtle to starting position
turtle.penup()
turtle.backward(300)  # Adjust starting position as needed

# Draw 4 columns
for _ in range(4):
turtle.left(90)  # Turn turtle to face upwards
turtle.pendown()  # Start drawing
turtle.forward(400)  # Draw column
turtle.penup()  # Stop drawing
turtle.right(90)  # Reorient to move horizontally
turtle.forward(100)  # Move to the next column start position
turtle.right(90)  # Turn turtle to face downwards
turtle.forward(400)  # Move back down to align with base without drawing
turtle.left(90)  # Reorient turtle to original direction

turtle.done()  # Prevent the window from closing immediately
``````

This version efficiently uses the turtle graphics commands to draw 4 vertical columns. It starts by moving the turtle to an initial position. Then, for each column, it performs the following steps:

1. Turns the turtle to face upwards.
2. Lowers the pen to start drawing.
3. Draws a vertical line (column) upwards.
4. Lifts the pen and moves horizontally to the right to position for the next column.
5. Turns and moves downwards without drawing to return to the base line.
6. Adjusts orientation to start the next column.

This approach reduces the amount of code needed and correctly utilizes loops and turtle movements to create the desired output.