Python Classes and Objects
Python Classes and Objects
A Basic Introduction
Coming up: Topics
1
Topics
? Objects and Classes ? Abstraction ? Encapsulation ? Messages
What are objects
? An object is a datatype that stores data, but ALSO has operations defined to act on the data. It knows stuff and can do stuff.
? Generally represent:
? tangible entities (e.g., student, airline ticket, etc.) ? intangible entities (e.g., data stream)
? Interactions between objects define the system operation (through message passing)
What are Objects
? A Circle drawn on the screen:
? Has attributes (knows stuff):
? radius, center, color
? Has methods (can do stuff):
? move ? change color
Design of Circle object
? A Circle object:
? center, which remembers the center point of the circle,
? radius, which stores the length of the circle's radius.
? color, which stores the color
? The draw method examines the center and radius to decide which pixels in a window should be colored.
? The move method sets the center to another location, and redraws the circle
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