[Python-ideas] A read-only, dict-like optparse.Value

[Thomas Lee]

Thanks Georg, this is pretty much exactly what I was looking for. 
Somehow I had never heard of the vars builtin before!

Regards,
Tom

Georg Brandl wrote:
> Thomas Lee schrieb:
>   
>> Hi folks,
>>
>> Would anybody support the idea of read-only dict-like behaviour of 
>> "options" for the following code:
>>
>> ====
>>
>> from optparse import OptionParser
>> parser = OptionParser()
>> parser.add_option("--host", dest="host" default="localhost")
>> parser.add_option("--port", dest="port", default=1234)
>> parser.add_option("--path", dest="path", default="/tmp")
>> options, args = parser.parse_args()
>>
>> ====
>>
>> As it is, you have to "know" what possible attributes are present on the 
>> options (effectively the set of "dest" attributes) -- I often implement 
>> something like the following because recently I've had to use command 
>> line options in a bunch of format strings:
>>
>> def make_options_dict(options):
>>     known_options = ("host", "port", "path")
>>     return dict(zip(known_options, [getattr(options, attr) for attr in 
>> known_options]))
>>     
>
> Perhaps
>
> options_dict = vars(options)
>
> already does what you want?  optparse seems to set nonpresent attributes
> for options to None.
>
> Georg
>
>