commit 056c31f9cc10a8697a40c817eae42f7e38a1cf80
author R David Murray <rdmurray@bitdance.com> Sat Jul 21 22:35:00 2012 -0400
committer R David Murray <rdmurray@bitdance.com> Sat Jul 21 22:35:00 2012 -0400
tree e8d441ef0f7d29458e98689559e54f4507a7fc77
parent 1a2c1fbfd2208407e1af365b161276b6f103c1ad

#12353: argparse now correctly handles null argument values.

Patch by Torsten Landschoff.

Lib/argparse.py

diff --git a/Lib/argparse.py b/Lib/argparse.py
index d867611..f365385 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1967,7 +1967,7 @@
         for arg_string in arg_strings:
 
             # for regular arguments, just add them back into the list
-            if arg_string[0] not in self.fromfile_prefix_chars:
+            if not arg_string or arg_string[0] not in self.fromfile_prefix_chars:
                 new_arg_strings.append(arg_string)
 
             # replace arguments referencing files with the file content