[Python-ideas] annoying dictionary problem, non-existing keys

Mathias Panzenböck grosser.meister.morti at gmx.net
Tue Apr 29 02:33:19 CEST 2008


bvidinli schrieb:
> i use dictionaries to hold some config data,
> such as:
> 
> conf={'key1':'value1','key2':'value2'}
> and so on...
> 
> when i try to process conf, i have to code every time like:
> if conf.has_key('key1'):
>      if conf['key1']<>'':
>          other commands....
> 
> 
> this is very annoying.
> in php, i was able to code only like:
> if conf['key1']=='someth'
> 
> in python, this fails, because, if key1 does not exists, it raises an exception.
> 
> MY question:
> is there a way to directly get value of an array/tuple/dict  item by key,
> as in php above, even if key may not exist,  i should not check if key exist,
> i should only use it, if it does not exist, it may return only empty,
> just as in php....
> 
> i hope you understand my question...
> 

if conf.get('key1','') == 'someth':
	...



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