[Python-ideas] argparse - add support for environment variables
tjreedy at udel.edu
Tue Mar 19 05:03:09 CET 2013
On 3/18/2013 7:02 PM, Miki Tebeka wrote:
> OK, so what's next in process? Got some +1 and some -1, how do we
> proceed? (or not).
> On Tuesday, February 19, 2013 8:03:16 AM UTC-8, Miki Tebeka wrote:
> The usual way of resolving configuration is command line ->
> environment -> default.
> Currently argparse supports only command line -> default, I'd like
> to suggest an optional "env" keyword to add_argument that will also
> resolve from environment. (And also optional env dictionary to the
> ArgumentParser __init__ method [or to parse_args], which will
> default to os.environ).
from os import environ as env
> parser = ArgumentParser()
> parser.add_argument('--spam', env='SPAM', default=7)
parser.add_argument('--spam', default = env.get('SPAM', 7))
This is about the same number of chars to type and I believe it is
available now in all versions. I like it better because it puts the e.v.
name and default right together.
Terry Jan Reedy
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