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

[Georg Brandl]

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

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