My argparse has only 3 flags (store_true) on the top level, everything else is handled through subparsers. When I run myprog.py --help, the output shows a list of all subcommands like normal, {sub1, sub2, sub3, sub4, ...}. So, the default is working great...
I usually can't remember the exact subcommand name I need, and all of its options. So I end up doing 2 help lookups:
myprog.py --help
myprog.py sub1 --help
I do this so often, I decided to cram this into one step. I would rather have my toplevel help output a huge summary, and then I scroll through the list manually. I find it is much faster (for me at least).
I was using a RawDescriptionHelpFormatter, and typing the long help output by hand. But now I have lots of subcommands, and its becoming a pain to manage.
Is there a way to get a verbose help output with just one program call?
If not, how can I iterate the subparsers of my argparse instance, and then retrieve the help output individually from each one (which I will then later glue together)?
Here is a quick outline of my argparse setup. I cleaned/stripped the code a fair bit, so this may not run without a bit of help.
parser = argparse.ArgumentParser(
prog='myprog.py',
formatter_class=argparse.RawDescriptionHelpFormatter,
description=textwrap.dedent(""" You can manually type Help here """) )
parser.add_argument('--debuglog', action='store_true', help='Verbose logging for debug purposes.')
parser.add_argument('--ipyonexit', action='store_true', help='Drop into an embeded Ipython session instead of exiting command.')
subparser = parser.add_subparsers()
### --- Subparser B
parser_b = subparser.add_parser('pdfreport', description="Used to output reports in PDF format.")
parser_b.add_argument('type', type=str, choices=['flatlist', 'nested', 'custom'],
help="The type of PDF report to generate.")
parser_b.add_argument('--of', type=str, default='',
help="Override the path/name of the output file.")
parser_b.add_argument('--pagesize', type=str, choices=['letter', '3x5', '5x7'], default='letter',
help="Override page size in output PDF.")
parser_b.set_defaults(func=cmd_pdf_report)
### ---- Subparser C
parser_c = subparser.add_parser('dbtables', description="Used to perform direct DB import/export using XLS files.")
parser_c.add_argument('action', type=str, choices=['push', 'pull', 'append', 'update'],
help="The action to perform on the Database Tables.")
parser_c.add_argument('tablename', nargs="+",
help="The name(s) of the DB-Table to operate on.")
parser_c.set_defaults(func=cmd_db_tables)
args = parser.parse_args()
args.func(args)
This is a bit tricky, as argparse does not expose a list of defined sub-parsers directly. But it can be done:
import argparse
# create the top-level parser
parser = argparse.ArgumentParser(prog='PROG')
parser.add_argument('--foo', action='store_true', help='foo help')
subparsers = parser.add_subparsers(help='sub-command help')
# create the parser for the "a" command
parser_a = subparsers.add_parser('a', help='a help')
parser_a.add_argument('bar', type=int, help='bar help')
# create the parser for the "b" command
parser_b = subparsers.add_parser('b', help='b help')
parser_b.add_argument('--baz', choices='XYZ', help='baz help')
# print main help
print(parser.format_help())
# retrieve subparsers from parser
subparsers_actions = [
action for action in parser._actions
if isinstance(action, argparse._SubParsersAction)]
# there will probably only be one subparser_action,
# but better safe than sorry
for subparsers_action in subparsers_actions:
# get all subparsers and print help
for choice, subparser in subparsers_action.choices.items():
print("Subparser '{}'".format(choice))
print(subparser.format_help())
This example should work for python 2.7 and python 3. The example parser is from Python 2.7 documentation on argparse sub-commands.
The only thing left to do is adding a new argument for the complete help, or replacing the built in -h/--help.