Change order of optional and required arguments in help text

sklearn_porter/__main__.py

@@ -15,30 +15,33 @@ def parse_args(args):
  epilog=(
  'More details on: '
  'https:/nok/sklearn-porter'))
- parser.add_argument(
+ parser._action_groups.pop()
+ required = parser.add_argument_group('Required arguments')
+ optional = parser.add_argument_group('Optional arguments')
+ required.add_argument(
  '--input', '-i',
  required=True,
  help=(
  'Path to an exported estimator '
  'in pickle (.pkl) format.'))
- parser.add_argument(
+ optional.add_argument(
  '--output', '-o',
  required=False,
  help=(
  'Path to the destination directory '
  'where the transpiled estimator will be '
  'stored.'))
- parser.add_argument(
+ optional.add_argument(
  '--class_name',
  default='Brain',
  required=False,
  help='Define the class name in the final output.')
- parser.add_argument(
+ optional.add_argument(
  '--method_name',
  default='predict',
  required=False,
  help='Define the method name in the final output.')
- parser.add_argument(
+ optional.add_argument(
  '--pipe', '-p',
  required=False,
  default=False,
@@ -52,14 +55,14 @@ def parse_args(args):
  'php': 'PHP',
  'ruby': 'Ruby'
  }
- parser.add_argument(
+ optional.add_argument(
  '--language', '-l',
  choices=languages.keys(),
  default='java',
  required=False,
  help=argparse.SUPPRESS)
  for key, lang in list(languages.items()):
- parser.add_argument(
+ optional.add_argument(
  '--{}'.format(key),
  action='store_true',
  help='Set {} as the target programming language.'.format(lang))