PyProtocols 0.9 
Author Message
 PyProtocols 0.9

Do you hate having to write lots of if-then logic to test what type
something is?  Wouldn't it be nice if you could just declare "I want this
object to have this behavior" and magically convert whatever value you
have, to the type you need?  PyProtocols lets you do just that, cleanly,
quickly, and robustly -- even with built-in types or other people's classes.

PyProtocols extends the PEP 246 adapt() function with a new "declaration
API" that lets you easily define your own interfaces and adapters, and
declare what adapters should be used to adapt what types, objects, or
interfaces.  In addition to its own Interface type, PyProtocols can also
use Twisted and Zope X3's Interface types.  (Of course, since Twisted and
Zope interfaces aren't as flexible, only a subset of the PyProtocols API
works with them.  Specific limitations are listed in the documentation.)

If you're familiar with Interface objects in Zope, Twisted, or PEAK, the
Interface objects in PyProtocols are very similar.  But, they can also do
many things that no other python interface types can do.  For example,
PyProtocols supports "subsetting" of interfaces, where you can declare that
one interface is a subset of another existing interface.  This is like
declaring that somebody else's existing interface is actually a subclass of
the new interface.  Twisted and Zope don't allow this, which makes them
very hard to use if you're trying to define interfaces like "Read-only
Mapping" as a subset of "Mapping Object".

Unlike Zope and Twisted, PyProtocols also doesn't force you to use a
particular interface coding style or even a specific interface type.  You
can use its built-in interface types, or define your own.  If there's
another Python package out there with interface types that you'd like to
use (CORBA? COM?), you can even create your own adapters to make them work
with the PyProtocols API.

PyProtocols is also the only interface package that supports automatic
"transitive adaptation".  That is, if you define an adapter from interface
A to interface B, and another from B to C, PyProtocols automatically
creates and registers a new adapter from A to C for you.  If you later
declare an explicit adapter from A to C, it silently replaces the
automatically created one.

PyProtocols may be used, modified, and distributed under the same terms
and conditions as Python or Zope.

PyProtocols resources include:

* Release notes, installation instructions, and browsable API docs:

* Source and Binary Releases:

* Reference Manual (HTML):

* Reference Manual (PDF):

* Browsable CVS Repository:

Version 0.9 of PyProtocols is a complete, working release, so you can
download it now and try it out.  But, the exact spellings of the API and
other interfaces may be subject to change in the future.  We would like
feedback from the community on the current API, as some API names may not
be clear or obvious yet.  Please contact the author with your input.

Thu, 24 Nov 2005 06:11:13 GMT  
 [ 1 post ] 

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