Classes Flashcards
class
Tell Python to make a new type of thing
object
Two meanings: the most basic type of thing, and any instance of something
instance
What you get when you tell Python to create a class
def
How you define a function inside a class
self
A variable for the instance/object being accessed in the functions in a class
inheritance
The concept that one class can inherit traits from another class
composition
The concept that a class can be composed of other classes as parts
attribute
A property classes have that are from composition and are usually variables
is-a
A phrase to say that something inherits from another, as in “salmon is-a fish”
has-a
A phrase to say that something is composed of other things or has a trait, as in “a salmon has-a mouth”
class X(Y)
“Make a class named X that is-a Y”.
class X(object): def \_\_init\_\_(self, J)
“class X has-a __init__ that takes self and J parameters”
class X(object): def M(self, J)
“class X has-a function named M that takes self and J parameters”
foo = X()
“Set foo to an instance of class X”
foo.M(J)
“From foo get the M function and call it with parameters self, J.”
