argparse subparser help indent too short

[TakingItCasual]

BPO	34724
Nosy	@TakingItCasual

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-09-18.16:49:27.712>
labels = ['type-bug', 'library']
title = 'argparse subparser help indent too short'
updated_at = <Date 2018-09-19.22:20:26.883>
user = 'https://github.com/TakingItCasual'

bugs.python.org fields:

activity = <Date 2018-09-19.22:20:26.883>
actor = 'paul.j3'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-09-18.16:49:27.712>
creator = 'TakingItCasual'
dependencies = []
files = []
hgrepos = []
issue_num = 34724
keywords = []
message_count = 3.0
messages = ['325663', '325665', '325808']
nosy_count = 2.0
nosy_names = ['paul.j3', 'TakingItCasual']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34724'
versions = ['Python 3.6']

[TakingItCasual]

The help is indented too early for subparsers with long argument names. I'm currently using the ProperIndentParser class from the following gist to create my top level parser, which fixes the issue:

https://gist.github.com/TakingItCasual/df40932dcc30012325bfed241bdaabd0

[TakingItCasual]

More detailed explanation on the SO post I found the HelpFormatter class from:

https://stackoverflow.com/q/32888815/2868017

[paulj3]

Looks like I had my say on this in the Stackoverflow link (3 yrs ago).

[slateny]

#87041 is a duplicate of this, but since that one has a handy example I'll close this one instead. The code in the gist is contained in the linked SO post which is linked in that issue too.