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dict that allows dependency definition.

Project description

An AutoRecalcDict is a subclass of dict that allows the user to create a standard python dict, but to also allow specifications for dependency lists that are on specific targets. Typical usage would be when you want a dict entry to automagically be recomputed if a dependency changes.

For example:

ard is an AutoRecalcDict and has keys called ‘target’, ‘dep1’, ‘dep2’ and ‘dep3’. The user wants the value of ard[‘target’] to be recomputed via a user defined function ff.

The calling sequence of function ff is defined as having three arguments: 1. self (ff will be converted to an instance method of ard) 2. target (the index into ard) 3. deplist (the list of keys that target depends upon).

Included in is a class called DepDescFunc. This is used to create the instance needed by AutoRecalcDict to know what targets are dependent on which dependency lists and the function needed to update the target.

See the module for examples of usage.

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