# 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

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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