SF patch 1631942 by Collin Winter:
(a) "except E, V" -> "except E as V"
(b) V is now limited to a simple name (local variable)
(c) V is now deleted at the end of the except block
diff --git a/Lib/poplib.py b/Lib/poplib.py
index 1cf114a..b7a7a8a 100644
--- a/Lib/poplib.py
+++ b/Lib/poplib.py
@@ -86,7 +86,7 @@
             try:
                 self.sock = socket.socket(af, socktype, proto)
                 self.sock.connect(sa)
-            except socket.error, msg:
+            except socket.error as msg:
                 if self.sock:
                     self.sock.close()
                 self.sock = None
@@ -262,7 +262,7 @@
         """Signoff: commit changes on server, unlock mailbox, close connection."""
         try:
             resp = self._shortcmd('QUIT')
-        except error_proto, val:
+        except error_proto as val:
             resp = val
         self.file.close()
         self.sock.close()
@@ -347,7 +347,7 @@
             try:
                 self.sock = socket.socket(af, socktype, proto)
                 self.sock.connect(sa)
-            except socket.error, msg:
+            except socket.error as msg:
                 if self.sock:
                     self.sock.close()
                 self.sock = None
@@ -399,7 +399,7 @@
         """Signoff: commit changes on server, unlock mailbox, close connection."""
         try:
             resp = self._shortcmd('QUIT')
-        except error_proto, val:
+        except error_proto as val:
             resp = val
         self.sock.close()
         del self.sslobj, self.sock