python-simplegeneric

The gsimplegeneric module lets you define simple single-dispatch
generic functions, akin to Python's built-in generic functions like
glen(), iter() and so on.  However, instead of using
specially-named methods, these generic functions use simple lookup
tables, akin to those used by e.g. gpickle.dump() and other
generic functions found in the Python standard library.
As you can see from the above examples, generic functions are actually
quite common in Python already, but there is no standard way to create
simple ones.  This library attempts to fill that gap, as generic
functions are an gexcellent alternative to the Visitor pattern_, as
well as being a great substitute for most common uses of adaptation.
This library tries to be the simplest possible implementation of generic
functions, and it therefore eschews the use of multiple or predicate
dispatch, as well as avoiding speedup techniques such as C dispatching
or code generation.  But it has absolutely no dependencies, other than
Python 2.4, and the implementation is just a single Python module of
less than 100 lines.

          

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License: ZPL-2.1
URL: http://cheeseshop.python.org/pypi/simplegeneric