# Chapter 5 - Summary¶

Chapter 5 included the following concepts from computing.

• Body Syntonic - Body syntonic means experiences related to knowledge of your body. You can use your knowledge of how to move your body to help you understand how to move the turtle objects.
• Comment - A comment describes one or more lines of code. Comments are ignored by the computer. A comment in Python starts with `#`. The computer will ignore everything from the start of the comment to the end of that line.
• Function - A function returns a value. An example of a function is `Screen()` which creates and returns a screen (drawing space) object.
• Object - Turtles are objects in Python. Objects can have data and behavior. A turtle object knows its heading (data) and can go forward and turn (behavior).
• Procedure - A procedure does an action, but doesn’t return a value. An example of a procedure is `forward(100)` which makes the turtle go forward by 100 pixels.

## Summary of Turtle Functions and Procedures¶

The table below shows the turtle functions and procedures that we have covered so far.

Name Input Description
backward amount Moves the turle backward by the specified amount
color colorname Sets the color for drawing. Use ‘red’, ‘black’, etc
forward amount Moves the turtle forward by the specified amount
goto x,y Moves the turtle to position x,y
left angle Turns the turtle counter clockwise by the specified angle
pendown None Puts down the turtles tail so that it draws when it moves
penup None Picks up the turtles tail so that it doesn’t draw when it moves
pensize width Sets the width of the pen for drawing
right angle Turns the turtle clockwise by the specified angle
setheading angle Turns the turtle to face the given heading. East is 0, north is 90, west is 180, and south is 270.
Turtle None Creates and returns a new turtle object

Note

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Next Section - Chapter 5 Exercises