This article asks what the Python frameworks do when they introspect a test module to discover what tests live inside of it. It also looks at details like how common test setup and teardown is supported, or not supported, by Zope, py.test and nose. Learn how these testing frameworks will support your Python development.

Look at how the leading Python testing frameworks provide robust auto-discovery of your application tests. Make sure your applications are written right the first time, and that they stay working through months and years of further tweaks and improvements.

Python 3 is the latest version of Guido van Rossum's powerful general-purpose programming language. It breaks backwards compatibility with the 2.x line but has cleaned up some syntax issues. This second article builds on the previous article, which focused on changes that affect the language and backwards compatibility issues. In Part 2 of this two-part series, discover more new Python features and details on more advanced topics such as changes in abstract base classes, metaclasses, and decorators.

Python 3 is the latest version of Guido van Rossum's powerful general-purpose programming language. Whether the Python community will accept version 3 is anyone's guess. The breaking of backwards compatibility will mean supporting two different versions in parallel. This article covers changes to input/output (I/O), the new bytes data type, changes to strings and string formatting, and finally, changes to the built-in dict type.

lxml is a fast yet flexible library for XML processing in Python. It comes bundled with support for XML Path Language (XPath) and Extensible Stylesheet Language Transformation (XSLT), and it implements the familiar ElementTree API. In this article, you focus both on the ease of use provided by lxml and on its high-performance profile when processing very large XML data.