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Model-driven engineering (MDE) is a software development methodology which focuses on creating and exploiting domain models (that is, abstract representations of the knowledge and activities that govern a particular application domain), rather than on the computing (or algorithmic) concepts.

PyX is a Python package for the creation of PostScript and PDF files. It combines an abstraction of the PostScript drawing model with a TeX/LaTeX interface. Complex tasks like 2d and 3d plots in publication-ready quality are built out of these primitives.

it is advised to somehow mix together (e.g. using exclusive or) the hash values for the components of the object that also play a part in comparison of objects.

If a class does not define a __cmp__() or __eq__() method it should not define a __hash__() operation either

Called when an attribute lookup has not found the attribute in the usual places (i.e. it is not an instance attribute nor is it found in the class tree for self). name is the attribute name. This method should return the (computed) attribute value or raise an AttributeError exception.

Using a 3D mouse with modo 601

The FOX toolkit is an open source, cross-platform widget toolkit, that is, a library of basic elements for building a graphical user interface (GUI). FOX stands for Free Objects for X.

FOX differentiates itself in the following way from other cross-platform toolkits: Tk is a cross-platform toolkit but does not have all of the widgets that FOX considers desirable. Qt had a different licensing model, which might have required a commercial license in some cases where FOX would not. (This is no longer the case starting with Qt 4.5.) wxWidgets promotes the use of native widgets on each supported platform. FLTK is a fast, low-footprint library that supports rapid application development, and requires less code to use, but lacks advanced widgets. All of these toolkits have some support for programming natively on Mac OS and/or Mac OS X platforms, which FOX currently does not support[

a well defined mental model of the problem domain

Refining the architecture is part of the "refactor mercilessly" rule

If you've never inherited from a built-in data type, experiment with a small test case in a throw away script. This way you don't mangle your current project and you can be as experimental as you like.