fix Python 3.1 compatibility, 1 test failure see note below

Note:

There is one harmless test failure due to "basestring" global name, I added
a comment to the src about it. It is basically same issue as on python 2.3
with "set" and "sorted".

1 files changed, 4 insertions, 0 deletions

diff --git a/argparse.py b/argparse.py
index bfd6127..3bdcd33 100644
--- a/argparse.py
+++ b/argparse.py
@@ -96,6 +96,10 @@ except NameError:
     # for python < 2.4 compatibility (sets module is there since 2.3):
     from sets import Set as set
 
+try:
+    basestring
+except NameError:
+    basestring = str
 
 try:
     sorted