Playing with dictionaries
David Eppstein
eppstein at ics.uci.edu
Mon Sep 22 14:17:28 EDT 2003
In article <eppstein-2C8472.10575222092003 at news.service.uci.edu>,
David Eppstein <eppstein at ics.uci.edu> wrote:
> def makehierarchy(dataset,prefix=''):
> for key in dataset:
> if dataset[key] is None:
> dataset[key] = prefix + key
> elif isinstance(dataset[key], dict):
> makehierarchy(dataset[key], prefix + key + ".")
> else:
> raise ValueError, "Unexpected data type in makehierarchy"
>
> >>> makehierarchy(dataset,'dataset')
Sorry, cut-and-paste error here -- updated the live code and forgot to
update the copy in my posting. That should be makehierarchy(dataset).
> >>> pprint.pprint(dataset)
> {'casts': {'experimenter': 'casts.experimenter',
> 'location': {'latitude': 'casts.location.latitude',
> 'longitude': 'casts.location.longitude'},
> 'time': 'casts.time',
> 'xbt': {'depth': 'casts.xbt.depth',
> 'temperature': 'casts.xbt.temperature'}},
> 'catalog_number': 'catalog_number',
> 'z': {'array': {'z': 'z.array.z'},
> 'maps': {'lat': 'z.maps.lat', 'lon': 'z.maps.lon'}}}
--
David Eppstein http://www.ics.uci.edu/~eppstein/
Univ. of California, Irvine, School of Information & Computer Science
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