Building and Transvering multi-level dictionaries
Nathan Clegg
nathan at islanddata.com
Mon Mar 20 21:04:30 EST 2000
On 21-Mar-2000 Eric Hagemann wrote:
>#add a key and setup for a sub-dictionary
> if(D.has_key('a') == 0)
> D['a'] = {}
In my opinion, this is a very dangerous habit to get into. Unlike C,
perl and python have more than one false value. I don't know that
you can be sure that a built-in such as this is guaranteed to be
consistent between versions of python. Even more dangerous is that
modules and functions written by others could use any of the false
values. I personally always return None for false. Seems to me much
safer to do:
if not D.has_key('a'):
D['a'] = {}
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Nathan Clegg
nathan at islanddata.com
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