Dictionaries

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B.5 Dictionaries

Python dictionaries are data structures that contain key:value pairs, sort of like a hash array. These are useful to store mini-databases of things. In CASA, the parameter values are kept in a dictionary behind the scenes.

To initialize a dictionary, say we call it mydict, for use:

CASA <7>: mydict = {}

To add members:

CASA <8>: mydict[’source’] = ’0137+331’
CASA <9>: mydict[’flux’] = 5.4

To see its contents:

CASA <10>: mydict
Out[10]: {’flux’: 5.4000000000000004, ’source’: ’0137+331’}
CASA <11>: print mydict
{’source’: ’0137+331’, ’flux’: 5.4000000000000004}

To access a specific entry:

CASA <12>: print mydict[’flux’]
5.4

B.5.1 Saving and Reading Dictionaries

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