|Code Listing by Bernhard Mulder|
This metaclass generates an __slot__ attribute automatically by examining the __init__ function of a class.
Shows how you can yield out of nested function calls. The version here works with methods.
Providing undo has become a standard feature for interactive programs. One approach to implement undo is to code each user level operation in three variants: a "do" version, an "undo" version, and a "redo" version.
This recipe implements an observer pattern for dictionaries and lists. It does not support a one-many relation. The observer is sent enough information so that the change can be undone.
Python 2.5 improved the support for generators, making it easier to
use coroutines. If you want to use coroutines, however, you can not
transfer control out of nested functions. You can eliminate this
restriction by systematically...
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