XML
Many Python programmers consider working with XML to be a right royal pain. However, XML is extremely popular for a wide range of purposes. Python programs frequently have to interact with it; both as a consumer that needs to interpret XML data from another source, and as a producer that needs to create XML data for other programs or computers to parse.
Python includes three well-documented libraries for interacting with XML documents in its standard library. Two are based on traditional XML parsing techniques, while the third is a nice Pythonic interface.
The SAX (Simple API for XML) library is an event-driven system that calls specific functions when specific objects are encountered in the byte stream: opening and closing tags, attributes, ...
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