Python

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Class

Back 1

Tell Python to make a new type of thing.

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Object

Back 2

Two meanings: the most basic type of thing, and any instance of some thing.

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Instance

Back 3

What you get when you tell Python to create a class.

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def

Back 4

How you define a function inside a class.

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self

Back 5

Inside the functions in a class, self is a variable for the instance/object being accessed.

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Inheritance

Back 6

The concept that one class can inherit traits from another class, much like you and your parents.

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Composition

Back 7

The concept that a class can be composed of other classes as parts, much like how a car has wheels.

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Attribute

Back 8

A property classes have that are from composition and are usually variables.

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is-a

Back 9

A phrase to say that something inherits from another, as in a "salmon" is-a "fish".

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has-a

Back 10

A phrase to say that something is composed of other things or has a trait, as in "a salmon has-a mouth."

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classX(Y)

Back 11

"Make a class named X that is-a Y."

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classX(object):def__init__(self, J)

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"class X has-a __init__that takes self and J parameters."

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classX(object):defM(self, J)

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"class X has-a function named M that takes self and J parameters."

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foo = X()

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"Set foo to an instance of class X."

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foo.M(J)

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"From foo get the M fucntion, and call it with parameters self, J."

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foo.K = Q

Back 16

"From foo get the attribute, and set it to Q."