New submission from d0n:
Hi,
first of all I want to thank you (bethard) for your great work and efforts on
developing argparse which is a great tool of versatile use in mostly all of my
programs.
I've faced a specific problem while implementing argparse which I have not been
able to fix by the functions supplied through argparse or its functions. And
here we are getting to it:
---
Lets assume I have a configuration file which sets the argparser argument of
"verbose" to True. Further we assume I would have done that by reading a
configuration file into an python-dictionary (maybe via ConfigParser or sth.
like that) and passing it to the function "set_defaults" of the class
"ArgumentParser" from argparse.
So far so good - now I have my default set. But now my "verbose" switch still
is setting the value for "verbose" to True (or False) regardless of the actual
state. So, I do not want to set my value for "verbose" to True and neither I
want it to set to False (or None) i want it to be set to the opposite value it
has till now
{code}
def opposite(bool):
if bool is True:
return False
elif bool is False:
return True
from argparse import ArgumentParser
parser = ArgumentParser()
parser.set_defaults(**config_defaults)
parser.add_argument('-V', '--verbose', dest='vrb', action='store_const',
const=opposite(config_defaults['verbose']), help='switch on/off verbosity')
{/code}
In that case I would be glad to just set my action to 'store_opposite' (or sth.
like that).
I am sorry if I have missed something here or was misguiding somehow.
Best regards,
d0n
----------
components: Extension Modules
messages: 220960
nosy: bethard, d0n
priority: normal
severity: normal
status: open
title: Argparse Revert config_file defaults
type: enhancement
versions: Python 3.5
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Python tracker <[email protected]>
<http://bugs.python.org/issue21805>
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