MinimalModbus is an easy-to-use Python module for talking to instruments (slaves) from a computer (master) using the Modbus protocol. Example code includes drivers for Eurotherm and Omega process controllers. The only dependency is the pySerial module. This software supports the ‘Modbus RTU’ serial communication version of the protocol, and is intended for use on Linux, OS X, and Windows platforms. It has been tested with Python2.6, Python2.7, and Python3.2.
bitstring is a Python module that helps to make the creation and analysis of binary data as simple and natural as possible. Objects can be constructed from integers (big and little endian), floats, hex, octal, binary, byte data, iterables, or files. They can be sliced, joined, reversed, packed, unpacked, inserted into, overwritten, and otherwise operated upon with simple functions or slice notation. They can also be parsed, searched, and navigated in, similar to a file or stream. Internally the data is efficiently stored as byte arrays. It is available for Python 2.6 and later (including Python 3).
Chouwa is a library that aims to ease the integration of Jinja2 into Django projects. It does this by providing equivalents of some of django's helper methods that depend on its template subsystem, as well as providing built-in globals and filters and providing a mechanism for user applications to introduce their own globals and filters.
Peggy helps you to create GTK applications that run out-of-the-egg. It offers functions to load resources (like .glade files, images, and locales) from a zipped or unzipped egg. It is a thin layer on top of setuptools and PyGtk. It doesn't do anything very fancy, but it can save you from reading some documentation.
PyMultimethods is a library that enables users to create multimethods (a.k.a. generic functions) in Python. In other words, you can create multiple versions of the same function/method. The one that is invoked depends on the runtime parameters. This is similar to polymorphism in the sense that the object type determines which version of the function is invoked. Multimethods go beyond the polymorphism found in conventional object oriented languages, however, because all parameters are taken into account (as opposed to only the "implied this", as in C++ or Java). PyMultimethods can also be used to "overload" a function or method.