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bpo-9938: Add optional keyword argument exit_on_error to argparse.ArgumentParser (GH-15362)

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Co-Authored-by: Xuanji Li <xuanji@gmail.com>


https://bugs.python.org/issue9938



Automerge-Triggered-By: @matrixise
This commit is contained in:
Hai Shi 2019-09-12 05:56:05 -05:00 • committed by Miss Islington (bot)
parent 2d32bf1ef2
commit f545638b57
4 changed files with 62 additions and 10 deletions
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26
Lib/argparse.py
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@ -1630,6 +1630,8 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
- conflict_handler -- String indicating how to handle conflicts
- add_help -- Add a -h/-help option
- allow_abbrev -- Allow long options to be abbreviated unambiguously
- exit_on_error -- Determines whether or not ArgumentParser exits with
error info when an error occurs
"""
def __init__(self,
@ -1644,7 +1646,8 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
argument_default=None,
conflict_handler='error',
add_help=True,
allow_abbrev=True):
allow_abbrev=True,
exit_on_error=True):
superinit = super(ArgumentParser, self).__init__
superinit(description=description,
@ -1663,6 +1666,7 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
self.fromfile_prefix_chars = fromfile_prefix_chars
self.add_help = add_help
self.allow_abbrev = allow_abbrev
self.exit_on_error = exit_on_error
add_group = self.add_argument_group
self._positionals = add_group(_('positional arguments'))
@ -1793,15 +1797,19 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
setattr(namespace, dest, self._defaults[dest])
# parse the arguments and exit if there are any errors
try:
if self.exit_on_error:
try:
namespace, args = self._parse_known_args(args, namespace)
except ArgumentError:
err = _sys.exc_info()[1]
self.error(str(err))
else:
namespace, args = self._parse_known_args(args, namespace)
if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
return namespace, args
except ArgumentError:
err = _sys.exc_info()[1]
self.error(str(err))
if hasattr(namespace, _UNRECOGNIZED_ARGS_ATTR):
args.extend(getattr(namespace, _UNRECOGNIZED_ARGS_ATTR))
delattr(namespace, _UNRECOGNIZED_ARGS_ATTR)
return namespace, args
def _parse_known_args(self, arg_strings, namespace):
# replace arg strings that are file references