Fix `except ... as`.

This would normally be done with 2to3.  But I'm trying to run the test
suite against 3, and urwid requires 2.6 anyway.

1 files changed, 1 insertions, 1 deletions

diff --git a/urwid/main_loop.py b/urwid/main_loop.py
index 5d3be1f..2c314d8 100755
--- a/urwid/main_loop.py
+++ b/urwid/main_loop.py
@@ -640,7 +640,7 @@ class SelectEventLoop(object):
             while True:
                 try:
                     self._loop()
-                except select.error, e:
+                except select.error as e:
                     if e.args[0] != 4:
                         # not just something we need to retry
                         raise