Tutorial: The Observer Pattern in Python 

Like many design patterns, the Observer in Python is different. A lot has been written about patterns since the turn of the century, for languages like Java, C++, C# and PHP. Curiously, though, much of that doesn't exactly apply to Python - or, at least, applies in a different way. Dynamic typing, functions as first-class objects, and some other additions to the object model all mean design patterns just work differently in this language.
++++Resources++++
Write-up and code examples:
newcircle.com/observer-tut
Advanced Python Newsletter:
migrateup.com/
Python Training from NewCircle:
newcircle.com/category/python

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