diff options
Diffstat (limited to 'Lib/argparse.py')
| -rw-r--r-- | Lib/argparse.py | 5 |
1 files changed, 4 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: |