[Nexus-developers] Python tree api

[Peter.Chang at Diamond.ac.uk]

Hi all,

Freddie: did you find out why I couldn't commit changes to svn?

Following on from the code camp, I would like to change the tree API in
a number of ways and want to hear peoples' opinions.

1) remove units.py dependency
2) remove matplotlib dependency
3) change SDS and NXdata to subclass ndarray
4) expose attributes via a public property, named 'attrs'. For example,
node.attrs.name accesses the 'name' attrib
5) add a dictionary access to any group object or attrs property with
the former allowing paths

1 & 2 are tidy ups to make tree more stand-alone and language/platform
neutral. There are a few PyPI packages to replace unit.py: units,
quantities and magnitude... Nexpy could subclass tree to add back its
functionality
3 reduces code and testing of SDS and NXdata
4 reduces namespace clashes 
4 & 5 melds h5py behaviour

Once done, I plan to implement a jython version using the Java NAPI and
ScisoftPy . 

Regards,
 Peter

-- 
Dr Peter Chang
T:+44 1235 778092; F:+44 1235 778468
Data Analyst Mathematical & Statistical Software Developer
Diamond Light Source Ltd,
Diamond House,
Harwell Science & Innovation Campus,
Didcot,
Oxfordshire
OX11 0DE


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