#15847: allow args to be a tuple in parse_args
This fixes a regression introduced by the fix for issue #13922. Although args
is not documented as being allowed to be a tuple, previously this worked and
so naturally there are programs in the field that depend on it.
Patch by Zbyszek Jędrzejewski-Szmek.
diff --git a/Lib/argparse.py b/Lib/argparse.py
index a738455..ab8ff2f 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1692,9 +1692,12 @@
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: