Python presentations

[andrea crotti]

For anyone interested, I already moved the slides on github
(https://github.com/AndreaCrotti/pyconuk2012_slides)
and for example the decorator slides will be generated from this:

https://raw.github.com/AndreaCrotti/pyconuk2012_slides/master/deco_context/deco.rst

Notice the literalinclude with :pyobject: which allows to include any
function or class automatically very nicely from external files ;)