# 4.8. Chapter Summary¶

This chapter included the following concepts from computing.

• 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.

• 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.

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