It seems that the Py3k "bytes" will be immutable (just like the Python 2.x "str"), and a "buffer" type will be mutable. Just see the new PEP 3137
[ Home | Articles | Account | People | Projects | FAQ ] New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!