Just by a brief look at your code snippet there are a few things that I
would point out, stylistically, that you may consider changing in your
code as they are generally not considered "pythonic":
* As already mentioned the "state" class is best if given a name
that is capitalized.
* As already mentioned the name "state" is (unintentionally)
re-used within the same scope. This could have been avoided
with the above naming convention change and also if the main
body of the code were in a function, say "main()"
* The "methods" default_board, default_types, and default_moves
appear to be static methods but are not defined as such.
* Also, since the above "methods" have no logic and simply return
a value they are probably best defined as static attributes
rather than methods. But if doing so you would need to alter
your constructor.
* You used a number of built-in names as attribute names (dir,
type). While this is legal Python it is generally not
recommended.
* You use range(0, n). 0 is the default start value for range()
so it is generally left out.
* You define a to_string() method. To have a string representation
of a class, one usually defines a __str__ method. This gives
the advantage whereby "print myobject" or '%s' % myjobject just
work.
Probably others can make more suggestions. You will find a lot of these
suggestions are borrowed from PEP8 [1] but you can peruse other people's
Python code to "learn from the masters".
Hope this helps,
-a
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