[Numpy-discussion] design patterns for computing

[Alan G Isaac]

It sounds to me like you have something closer to the 
following.

class Problem
  - initialized with an Input instance and an Analysis instance
  - has a ``get_results`` method that asks the Analysis instance to
        - call ``get_input`` on Input instance
        - run analysis on the provided input
        - create and return and instance of a Results class

Instances of the Input class can then produce input anyway 
you like---e.g., as data containers or as data fetchers---as 
long as they provide it in a standard format
in response to ``get_input``.

fwiw,
Alan Isaac