[issue9350] add remove_argument_group to argparse

[Irit Katriel]

Change by Irit Katriel :


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stage: needs patch -> resolved
status: pending -> closed

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[issue9350] add remove_argument_group to argparse

[Irit Katriel]

Irit Katriel  added the comment:

This is over a decade old and the discussion is mostly that it's not worth 
doing, so I suggest we close.

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resolution:  -> rejected
status: open -> pending

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[issue9350] add remove_argument_group to argparse

[hai shi]

hai shi  added the comment:

paul, raymond. Thanks for give me a quick answer:).
Looks raymond's reason is good enough, i just only consider this question from  
 
api completeness(as paul said) not from user case.

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[issue9350] add remove_argument_group to argparse

[Raymond Hettinger]

Raymond Hettinger  added the comment:

> The use case for me is I create an argument group and 
> then conditionally add a bunch of arguments to it.  
> If zero arguments are added I would like to then remove
> the group so that an empty group does not show up 
> in the help output.

ISTM this use is likely rare enough that it doesn't warrant an API expansion.  
The argparse API is already somewhat large, so we should only expand it when 
there is a compelling benefit or the absence of a reasonable workaround (i.e. 
lazily adding a group only when the first argument is added).

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[issue9350] add remove_argument_group to argparse

[paul j3]

paul j3  added the comment:

hai shi

Do you have a specific need for this, or do you want it just for the same of 
completeness?

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[issue9350] add remove_argument_group to argparse

[hai shi]

hai shi  added the comment:

IMHO, if we supply the ability to add an argument group, we need add the 
ability to remove the argument group too.

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[issue9350] add remove_argument_group to argparse

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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[issue9350] add remove_argument_group to argparse

[paul j3]

paul j3 added the comment:

If the empty argument group has a 'description' it is displayed.  For example 
with positionals group that I mentioned earlier:

 parser = argparse.ArgumentParser()
 parser._action_groups[0].description = 'test'
 parser.print_help()

produces

usage: ipython [-h]

positional arguments:
  test

optional arguments:
   -h, --help  show this help message and exit

So the user can fix this empty group display issue by setting this 
'description' value to None.

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[issue9350] add remove_argument_group to argparse

[paul j3]

paul j3 added the comment:

I wonder if this patch is needed.

- there hasn't been discussion in 4 years

- In Steven's use case, a group without any arguments, the group does not show 
up.  A common example of an empty argument group, is a parser without any user 
defined arguments.  

p=argparse.ArgumentParser(prog='PROG')
p.print_help()

usage: PROG [-h]
optional arguments:
  -h, --help  show this help message and exit

The empty 'positional arguments' group is not displayed.

Removing a group that has arguments is more complicated (and error prone) since 
it requires removing those arguments as well.  There is a '_remove_action' 
method.  But as best I can tell it is only used by '_handle_conflict_resolve', 
a rarely used alternative conflict handler.

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[issue9350] add remove_argument_group to argparse

[Mark Lawrence]

Changes by Mark Lawrence breamore...@yahoo.co.uk:


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versions: +Python 2.7, Python 3.5 -Python 3.4

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[issue9350] add remove_argument_group to argparse

[Sanjeev Paskaradevan]

Changes by Sanjeev Paskaradevan sanjeev@gmail.com:


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[issue9350] add remove_argument_group to argparse

[Sanjeev Paskaradevan]

Changes by Sanjeev Paskaradevan sanjeev@gmail.com:


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keywords: +patch
Added file: http://bugs.python.org/file29489/remove_argument_group.patch

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[issue9350] add remove_argument_group to argparse

[Sanjeev Paskaradevan]

Changes by Sanjeev Paskaradevan sanjeev@gmail.com:


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versions: +Python 3.4

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[issue9350] add remove_argument_group to argparse

[Steven Bethard]

New submission from Steven Bethard steven.beth...@gmail.com:

[From http://code.google.com/p/argparse/issues/detail?id=71]

There is a method ArgumentParser.add_argument_group() to create and add an 
argument group to the parser.  I would like the ability to remove an argument 
group via a method like remove_argument_group(group).

The use case for me is I create an argument group and then conditionally add a 
bunch of arguments to it.  If zero arguments are added I would like to then 
remove the group so that an empty group does not show up in the help output.

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components: Library (Lib)
messages: 111321
nosy: bethard
priority: normal
severity: normal
stage: needs patch
status: open
title: add remove_argument_group to argparse
type: feature request

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