19.3. Objects Revisited

In Python, every value is actually an object. Whether it be a turtle, a list, or even an integer, they are all objects. Programs manipulate those objects either by performing computation with them or by asking them to perform methods. To be more specific, we say that an object has a state (also called attributes or properties) and a collection of methods (also called behavior) that it can perform. The state of an object represents those things that the object knows about itself. For example, as we have seen with turtle objects, each turtle has a state consisting of the turtle’s position, its color, its heading and so on. Each turtle also has the ability to go forward, backward, or turn right or left. Individual turtles are different in that even though they are all turtles, they differ in the specific values of the individual state attributes (maybe they are in a different location or have a different heading).

Simple object has state and methods

k .. mchoice:: class-basics-turtle-object-attributes

System Message: ERROR/3 (/home/bmiller/Runestone/web2py/applications/runestone/books/py4e-int/_sources/classes-basics/ObjectsRevisited.rst, line 28)

Unexpected indentation.

practice

T

answer_a

pos (x and y position)

answer_b

pen color

answer_c

forward

answer_d

left

correct

a, b

feedback_a

Turtle objects know their position.

feedback_b

Turtle objects know their pen color.

feedback_c

This is a behavior (something the object can do) not an attribute (data about itself).

feedback_d

This is a behavior (something the object can do) not an attribute (data about itself).

Which of the following is/are attributes (state) for objects of the Turtle class?

You have attempted of activities on this page