Merge #13922: argparse no longer incorrectly strips '--' after the first one.

Patch by Jeff Knupp.

1 files changed, 5 insertions, 2 deletions

diff --git a/Lib/argparse.py b/Lib/argparse.py
index 74c456f..cc3e374 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -2189,9 +2189,12 @@ class ArgumentParser(_AttributeHolder, _ActionsContainer):
     # Value conversion methods
     # ========================
     def _get_values(self, action, arg_strings):
-        # for everything but PARSER args, strip out '--'
+        # for everything but PARSER, REMAINDER args, strip out first '--'
         if action.nargs not in [PARSER, REMAINDER]:
-            arg_strings = [s for s in arg_strings if s != '--']
+            try:
+                arg_strings.remove('--')
+            except ValueError:
+                pass
 
         # optional argument produces a default when not present
         if not arg_strings and action.nargs == OPTIONAL: