Playing with dictionaries
Raymond Hettinger
vze4rx4y at verizon.net
Mon Sep 22 14:07:05 EDT 2003
[Roberto A. F. De Almeida]
> Suppose I have a dictionary containg nested dictionaries. Something
> like this:
>
> >>> pprint.pprint(dataset)
> {'casts': {'experimenter': None,
> 'location': {'latitude': None,
> 'longitude': None},
> 'time': None,
> 'xbt': {'depth': None,
> 'temperature': None}},
> 'catalog_number': None,
> 'z': {'array': {'z': None},
> 'maps': {'lat': None,
> 'lon': None}}}
>
> I want to assign to the values in the dictionary the hierarchy of keys
> to it. For example:
>
> >>> dataset['casts']['experimenter'] = 'casts.experimenter'
> >>> dataset['z']['array']['z'] = 'z.array.z'
>
> Of course I would like to do this automatically, independent of the
> structure of the dictionary. Is there an easy way to do it?
>>> def f(d):
for k, v in d.iteritems():
if v is None:
yield k
else:
for name in f(v):
yield k + '.' + name
>>> list(f(d))
['casts.xbt.depth', 'casts.xbt.temperature', 'casts.experimenter',
'casts.location.latitude', 'casts.location.longitude', 'casts.time',
'z.maps.lat', 'z.maps.lon', 'z.array.z', 'catalog_number']
Raymond Hettinger
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