Quotes About Attributes

Whereas things exist, are in space and time and have properties such as hardness, colour, etc.

Experience and enthusiasm are two fine business attributes seldom found in one individual.

As a filmmaker, deep blacks are essential, and in my experience, no technology captures those attributes as well as Plasma.

People will always point out your faults, but will hesitate to point out your attributes

Mr. Hogan is not tall himself, at five feet ten inches

My Father is a photographer, so it was always around. I was trained in painting, so I learnt a lot of skills about composition, light, colour, the formal attributes of images.

People despise the lust for power that originates from a craving for homage and for the attributes of power.

Dígame, señor Aladino, ¿usted de qué signo es? - Virgo, para servirle a usted. - ¿Virgo? Impulsivo, sensible reservado, activo, inteligencia racional, sentido práctico, devoción, fidelidad. Y también tendencia al surmenaje.

In fact, within Python, instance and class objects are mostly just dictionaries with links between them.

but slots — and other "virtual" attributes — won't be reported as instance data.

This search order is called the new-style MRO for "method resolution order" (and often just MRO for short when used in contrast with the DFLR order). Despite the name, this is used for all attributes in Python, not just methods.

A better and less commonly used solution would be to use two underscores at the front of the method name only: __gatherAttrs for us. Python automatically expands such names to include the enclosing class's name, which makes them truly unique when looked up by the inheritance search. This is a feature usually called pseudoprivate class attributes, which we'll expand on in Chapter 31 and deploy in an expanded version of this class there.

All the statements inside the class statement run when the class statement itself runs (not when the class is later called to make an instance).

the attributes of a namespace object are usually implemented as dictionaries, and class inheritance trees are (generally speaking) just dictionaries with links to other dictionaries.

In Chapter 32, we'll also meet Python static methods (akin to those in C++), which are just self-less functions that usually process class attributes.

Assignments to instance attributes create or change the names in the instance, rather than in the shared class.

Assignments to instance attributes create or change the names in the instance, rather than in the shared class. More generally, inheritance searches occur only on attribute references, not on assignment:

Normally we create instance attributes by assigning them in class __init__ constructor methods, but this isn't the only option.

Class attributes can also be created, though, by assigning attributes to the class anywhere a reference to the class object exists — even outside the class statement.

Again, though, they may be created by assignment anywhere a reference to the instance appears, even outside the class statement. Normally, all instance attributes are initialized in the __init__ constructor method; that way, later method calls can assume the attributes already exist.

Although other techniques (such as enclosing scope reference closures) can save details, too, instance attributes make this very explicit and easy to understand.

As we get deeper into Python classes, though, keep in mind that the OOP model in Python is very simple; as we've seen here, it's really just about looking up attributes in object trees and a special function argument.

everything is a "first class" object in Python —

This method is a bit trickier to use, though, because assigning to any self attributes within __setattr__ calls __setattr__ again, potentially causing an infinite recursion loop (and a fairly quick stack overflow exception!).