|Code Listing by Zoran Isailovski|
Sample Pythonic Inversion-of-Control Pseudo-Container.
Closures are powerful. Closures are beautiful. But: Closures are TRICKY!
This is an anti-recipe, a caveat about some obscure pitfalls with closures - or the way they are implemented in python.
And now for the caveats: Two...
The memento pattern is great for transaction-like processing. Having a handy implementation around might not be the worst thing.
True immutable symbolic enumeration with qualified value access.
Here is yet another way to emulate a switch-case statement, perhaps one you might not have thought of.
Whenever I feel the impulse to write a class, I pause for a moment and think whether I can get away with a closure. This time I will be using closures to readably and flexibly customize the sorting of sequences (for Pythons 2.1 through 2.3).
Some file processing tasks are quite time consuming, especially when COM is involved. Unnecessary repetitions are then unbearable. Here is a module that helps avoid them.
Every now and then I "discover" a cute one-liner data transformation idiom. Here is one to revert the order of columns in a 2-D iterable. It comes in handy to invert a dictionary (i.e. to swap keys and values).
IMPROVED. The concept of events is heavily used in GUI libraries and is the foundation for most implementations of the MVC (Model, View, Controller) design pattern (the latter being my prime motivation for this recipe). Another prominent use of...
Sometimes you need strings to be true identifiers, for ex. to represent symbolic names. Smalltalk offers the type 'Symbol' for this purpose. In python, you need to test this explicitly. Here is a quick way.
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