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The Python Computer Graphics Kit is an Open Source software package containing a collection of Python modules, plugins and utilities that are meant to be useful for any domain where you have to deal with 3D data of any kind, be it for visualization, creating photorealistic images, Virtual Reality or even games.

Provides access to specialized input hardware such as SpaceMouse/SpaceBall, data glove or tablet via wrappers around the 3DxWare SDK by 3Dconnexion, the Wintab Developer Kit by LCS/Telegraphics and the Data Glove SDK by Fifth Dimension Technologies.

usually __iter__() just return self if you have already define the next() method (generator object)

While you are looking at the collections module, consider inheriting from Sequence, Mapping or another abstract base class if that is more appropriate. Here is an example for a Sequence subclass:

if hasattr(self.data[0], "__iter__": return self.data[0].__iter__() return self.data.__iter__()

Metaprogramming is the writing of computer programs that write or manipulate other programs (or themselves) as their data, or that do part of the work at compile time that would otherwise be done at runtime.

ABOUT Slut is a programming framework for generative, synthetic, interactive, network-enabled graphics. Slut generates images from processes. Such processes may be simple "construction plans" or they may depend on user input. They may be drawn from incoming network data or messages that are sent to the network. Produced images may be adaptive, accumulative or static. They may look and feel like computer games or they may inform like scientific visualizations. They may be lyrical, cynical, political, intrusive (literally over the network), simply beautiful or banal.

No need to jump through these loops, See 5.1.1 Using Lists as Stacks

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.

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.

Parameters are passed by value

some data types are mutable, but others aren't

If you pass a mutable object into a method, the method gets a reference to that same object and you can mutate it to your heart's delight, but if you rebind the reference in the method, the outer scope will know nothing about it, and after you're done, the outer reference will still point at the original object.

def PreOrder(self): print self.data if self.left: print self.left.PreOrder() if self.right: print self.right.PreOrder()