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Code Listing by Jim Baker

Code 1-3 of 3   






Implements the three standard relational join algorithms: nested loops join, hash join, and merge join, using the iterator algebra support in Python 2.4. This recipe presents code that can be used for inner join, left outer join, full outer join, and semijoins. The nested loops join supports a theta join.



Implements the observer design pattern via generator coroutines, wrapped up to use the new 'with' statement of Python 2.5. Enables the loosely-coupled observation of any container implementing the dictionary protocol.



Implements the toposort and strongly_connected_components graph algorithms,
as a demonstration of how to use the recipe, 'Implementing the observer pattern
yet again: this time with coroutines and the with statement'.

See...