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-rw-r--r--Lib/argparse.py5
-rw-r--r--Lib/test/test_argparse.py18
2 files changed, 22 insertions, 1 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py
index adecb88..d5976e9 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1709,9 +1709,12 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
return args
def parse_known_args(self, args=None, namespace=None):
- # args default to the system args
if args is None:
+ # args default to the system args
args = _sys.argv[1:]
+ else:
+ # make sure that args are mutable
+ args = list(args)
# default Namespace built from parser defaults
if namespace is None:
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index 72060da..caf99af 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -4613,6 +4613,24 @@ class TestTypeFunctionCallWithNonStringDefault(TestCase):
class TestParseKnownArgs(TestCase):
+ def test_arguments_tuple(self):
+ parser = argparse.ArgumentParser()
+ parser.parse_args(())
+
+ def test_arguments_list(self):
+ parser = argparse.ArgumentParser()
+ parser.parse_args([])
+
+ def test_arguments_tuple_positional(self):
+ parser = argparse.ArgumentParser()
+ parser.add_argument('x')
+ parser.parse_args(('x',))
+
+ def test_arguments_list_positional(self):
+ parser = argparse.ArgumentParser()
+ parser.add_argument('x')
+ parser.parse_args(['x'])
+
def test_optionals(self):
parser = argparse.ArgumentParser()
parser.add_argument('--foo')