diff --git a/builder/kojid b/builder/kojid
index 6c2d490a..3d740db5 100755
--- a/builder/kojid
+++ b/builder/kojid
@@ -1976,7 +1976,7 @@ class ChainMavenTask(MultiPlatformTask):
                 del todo[package]
             try:
                 results = self.wait(running.keys())
-            except (six.moves.xmlrpc_client.Fault, koji.GenericError), e:
+            except (six.moves.xmlrpc_client.Fault, koji.GenericError) as e:
                 # One task has failed, wait for the rest to complete before the
                 # chainmaven task fails.  self.wait(all=True) should thrown an exception.
                 self.wait(all=True)
@@ -2113,7 +2113,7 @@ class TagBuildTask(BaseTaskHandler):
             #XXX - add more post tests
             self.session.host.tagBuild(self.id,tag_id,build_id,force=force,fromtag=fromtag)
             self.session.host.tagNotification(True, tag_id, fromtag, build_id, user_id, ignore_success)
-        except Exception, e:
+        except Exception as e:
             exctype, value = sys.exc_info()[:2]
             self.session.host.tagNotification(False, tag_id, fromtag, build_id, user_id, ignore_success, "%s: %s" % (exctype, value))
             raise e
@@ -2676,10 +2676,10 @@ class ImageTask(BaseTaskHandler):
         self.ks = ksparser.KickstartParser(version)
         try:
             self.ks.readKickstart(kspath)
-        except IOError, e:
+        except IOError as e:
             raise koji.LiveCDError("Failed to read kickstart file "
                                    "'%s' : %s" % (kspath, e))
-        except kserrors.KickstartError, e:
+        except kserrors.KickstartError as e:
             raise koji.LiveCDError("Failed to parse kickstart file "
                                     "'%s' : %s" % (kspath, e))
 
@@ -3291,10 +3291,10 @@ class OzImageTask(BaseTaskHandler):
         self.logger.debug('attempting to read kickstart: %s' % kspath)
         try:
             ks.readKickstart(kspath)
-        except IOError, e:
+        except IOError as e:
             raise koji.BuildError("Failed to read kickstart file "
                                    "'%s' : %s" % (kspath, e))
-        except kserrors.KickstartError, e:
+        except kserrors.KickstartError as e:
             raise koji.BuildError("Failed to parse kickstart file "
                                     "'%s' : %s" % (kspath, e))
         return ks
@@ -4228,7 +4228,7 @@ class BuildIndirectionImageTask(OzImageTask):
                 base_factory_image = _nvr_to_image(opts['base_image_build'], opts['arch'])
             else:
                 base_factory_image = _task_to_image(int(opts['base_image_task']))
-        except Exception, e:
+        except Exception as e:
             self.logger.exception(e)
             raise
 
@@ -4290,7 +4290,7 @@ class BuildIndirectionImageTask(OzImageTask):
                         image_id=base_factory_image.identifier,
                         parameters=params)
                     target.target_thread.join()
-            except Exception, e:
+            except Exception as e:
                 self.logger.debug("Exception encountered during target build")
                 self.logger.exception(e)
         finally:
@@ -5633,7 +5633,7 @@ if __name__ == "__main__":
             # authenticate using SSL client certificates
             session.ssl_login(options.cert, None,
                               options.serverca)
-        except koji.AuthError, e:
+        except koji.AuthError as e:
             quit("Error: Unable to log in: %s" % e)
         except six.moves.xmlrpc_client.ProtocolError:
             quit("Error: Unable to connect to server %s" % (options.server))
@@ -5653,9 +5653,9 @@ if __name__ == "__main__":
             session.krb_login(principal=krb_principal,
                               keytab=options.keytab,
                               ccache=options.ccache)
-        except krbV.Krb5Error, e:
+        except krbV.Krb5Error as e:
             quit("Kerberos authentication failed: '%s' (%s)" % (e.args[1], e.args[0]))
-        except socket.error, e:
+        except socket.error as e:
             quit("Could not connect to Kerberos authentication service: '%s'" % e.args[1])
     else:
         quit("No username/password supplied and Kerberos missing or not configured")
diff --git a/cli/koji b/cli/koji
index 1c1b1c05..4a192fcb 100755
--- a/cli/koji
+++ b/cli/koji
@@ -240,7 +240,7 @@ def get_options():
     # load local config
     try:
         result = koji.read_config(options.profile, user_config=options.configFile)
-    except koji.ConfigurationError, e:
+    except koji.ConfigurationError as e:
         parser.error(e.args[0])
         assert False  # pragma: no cover
 
@@ -342,7 +342,7 @@ class TaskWatcher(object):
         error = None
         try:
             result = self.session.getTaskResult(self.id)
-        except (six.moves.xmlrpc_client.Fault,koji.GenericError),e:
+        except (six.moves.xmlrpc_client.Fault,koji.GenericError) as e:
             error = e
         if error is None:
             # print("%s: complete" % self.str())
@@ -550,7 +550,7 @@ def list_task_output_all_volumes(session, task_id):
     """List task output with all volumes, or fake it"""
     try:
         return session.listTaskOutput(task_id, all_volumes=True)
-    except koji.GenericError, e:
+    except koji.GenericError as e:
         if 'got an unexpected keyword argument' not in str(e):
             raise
     # otherwise leave off the option and fake it
@@ -944,7 +944,7 @@ def _progress_callback(uploaded, total, piece, time, total_time):
 def _running_in_bg():
     try:
         return (not os.isatty(0)) or (os.getpgrp() != os.tcgetpgrp(0))
-    except OSError, e:
+    except OSError as e:
         return True
 
 def handle_build(options, session, args):
@@ -1167,7 +1167,7 @@ def handle_maven_build(options, session, args):
         try:
             params = koji.util.parse_maven_param(build_opts.inis, scratch=build_opts.scratch,
                                                  section=build_opts.section)
-        except ValueError, e:
+        except ValueError as e:
             parser.error(e.args[0])
         opts = params.values()[0]
         if opts.pop('type', 'maven') != 'maven':
@@ -1226,7 +1226,7 @@ def handle_wrapper_rpm(options, session, args):
         try:
             params = koji.util.parse_maven_param(build_opts.inis, scratch=build_opts.scratch,
                                                  section=build_opts.section)
-        except ValueError, e:
+        except ValueError as e:
             parser.error(e.args[0])
         opts = params.values()[0]
         if opts.get('type') != 'wrapper':
@@ -1300,7 +1300,7 @@ def handle_maven_chain(options, session, args):
             opts[key] = val
     try:
         builds = koji.util.parse_maven_chain(args[1:], scratch=opts.get('scratch'))
-    except ValueError, e:
+    except ValueError as e:
         parser.error(e.args[0])
     priority = None
     if build_opts.background:
@@ -1675,7 +1675,7 @@ def handle_import(options, session, args):
         sys.stdout.flush()
         try:
             session.importRPM(serverdir, os.path.basename(path))
-        except koji.GenericError, e:
+        except koji.GenericError as e:
             print(_("\nError importing: %s" % str(e).splitlines()[-1]))
             sys.stdout.flush()
         else:
@@ -2284,7 +2284,7 @@ def handle_prune_signed_copies(options, session, args):
                         print("Unlinking: %s" % signedpath)
                     try:
                         os.unlink(signedpath)
-                    except OSError, e:
+                    except OSError as e:
                         print("Error removing %s: %s" % (signedpath, e))
                         print("This script needs write access to %s" % koji.BASEDIR)
                         continue
@@ -2304,7 +2304,7 @@ def handle_prune_signed_copies(options, session, args):
                         print("Removing dir: %s" % dir)
                     try:
                         os.rmdir(dir)
-                    except OSError, e:
+                    except OSError as e:
                         print("Error removing %s: %s" % (signedpath, e))
             if len(sigdirs) == 1:
                 dir = sigdirs.keys()[0]
@@ -2315,7 +2315,7 @@ def handle_prune_signed_copies(options, session, args):
                         print("Removing dir: %s" % dir)
                     try:
                         os.rmdir(dir)
-                    except OSError, e:
+                    except OSError as e:
                         print("Error removing %s: %s" % (signedpath, e))
             elif len(sigdirs) > 1:
                 print("Warning: more than one signature dir for %s: %r" % (sigkey, sigdirs))
@@ -2549,7 +2549,7 @@ def handle_import_in_place(options, session, args):
         sys.stdout.write(_("importing %s... ") % nvr)
         try:
             session.importBuildInPlace(data)
-        except koji.GenericError, e:
+        except koji.GenericError as e:
             print(_("\nError importing: %s" % str(e).splitlines()[-1]))
             sys.stdout.flush()
         else:
@@ -6735,7 +6735,7 @@ def anon_handle_download_build(options, session, args):
         # We want the latest build, not a specific build
         try:
             builds = session.listTagged(suboptions.latestfrom, latest=True, package=build, type=suboptions.type)
-        except koji.GenericError, data:
+        except koji.GenericError as data:
             print("Error finding latest build: %s" % data)
             return 1
         if not builds:
@@ -7382,7 +7382,7 @@ def handle_runroot(options, session, args):
             kwargs['new_chroot'] = True
 
         task_id = session.runroot(tag, arch, command, **kwargs)
-    except koji.GenericError, e:
+    except koji.GenericError as e:
         if 'Invalid method' in str(e):
             print("* The runroot plugin appears to not be installed on the"
                   " koji hub.  Please contact the administrator.")
@@ -7458,7 +7458,7 @@ def handle_save_failed_tree(options, session, args):
 
     try:
         task_id = session.saveFailedTree(br_id, opts.full)
-    except koji.GenericError, e:
+    except koji.GenericError as e:
         m = str(e)
         if 'Invalid method' in m:
             print(_("* The save_failed_tree plugin appears to not be "
@@ -7573,9 +7573,9 @@ def activate_session(session):
                 session.krb_login(principal=options.principal, keytab=options.keytab, proxyuser=options.runas)
             else:
                 session.krb_login(proxyuser=options.runas)
-        except socket.error, e:
+        except socket.error as e:
             warn(_("Could not connect to Kerberos authentication service: %s") % e.args[1])
-        except Exception, e:
+        except Exception as e:
             if krbV is not None and isinstance(e, krbV.Krb5Error):
                 error(_("Kerberos authentication failed: %s (%s)") % (e.args[1], e.args[0]))
             else:
diff --git a/hub/kojihub.py b/hub/kojihub.py
index 627fb78f..2fec4ea3 100644
--- a/hub/kojihub.py
+++ b/hub/kojihub.py
@@ -421,7 +421,7 @@ class Task(object):
             # If the result is a Fault, then loads will raise it
             # This is normally what we want to happen
             result, method = six.moves.xmlrpc_client.loads(xml_result)
-        except six.moves.xmlrpc_client.Fault, fault:
+        except six.moves.xmlrpc_client.Fault as fault:
             if raise_fault:
                 raise
             # Note that you can't really return a fault over xmlrpc, except by
@@ -8800,7 +8800,7 @@ class RootExports(object):
         fn = get_upload_path(path, name, create=True, volume=volume)
         try:
             st = os.lstat(fn)
-        except OSError, e:
+        except OSError as e:
             if e.errno == errno.ENOENT:
                 pass
             else:
@@ -8869,7 +8869,7 @@ class RootExports(object):
         data = {}
         try:
             fd = os.open(fn, os.O_RDONLY)
-        except OSError, e:
+        except OSError as e:
             if e.errno == errno.ENOENT:
                 return None
             else:
@@ -8877,7 +8877,7 @@ class RootExports(object):
         try:
             try:
                 fcntl.lockf(fd, fcntl.LOCK_SH|fcntl.LOCK_NB)
-            except IOError, e:
+            except IOError as e:
                 raise koji.LockError(e)
             st = os.fstat(fd)
             if not stat.S_ISREG(st.st_mode):
@@ -10387,7 +10387,7 @@ class RootExports(object):
                             #handle older base64 encoded data
                             val = base64.decodestring(val)
                         data, method = six.moves.xmlrpc_client.loads(val)
-                    except six.moves.xmlrpc_client.Fault, fault:
+                    except six.moves.xmlrpc_client.Fault as fault:
                         data = fault
                     task[f] = data
             yield task
@@ -12430,7 +12430,7 @@ class HostExports(object):
             logger.debug("os.link(%r, %r)", rpmpath, l_dst)
             try:
                 os.link(rpmpath, l_dst)
-            except OSError, ose:
+            except OSError as ose:
                 if ose.errno == 18:
                     shutil.copy2(
                         rpmpath, os.path.join(archdir, bnplet, bnp))
@@ -12527,7 +12527,7 @@ def handle_upload(environ):
     try:
         try:
             fcntl.lockf(fd, fcntl.LOCK_EX|fcntl.LOCK_NB)
-        except IOError, e:
+        except IOError as e:
             raise koji.LockError(e)
         if offset == -1:
             offset = os.lseek(fd, 0, 2)
diff --git a/hub/kojixmlrpc.py b/hub/kojixmlrpc.py
index bee6b5b5..4f4d2b87 100644
--- a/hub/kojixmlrpc.py
+++ b/hub/kojixmlrpc.py
@@ -244,7 +244,7 @@ class ModXMLRPCRequestHandler(object):
             # wrap response in a singleton tuple
             response = (response,)
             response = dumps(response, methodresponse=1, allow_none=1)
-        except Fault, fault:
+        except Fault as fault:
             self.traceback = True
             response = dumps(fault)
         except:
@@ -338,7 +338,7 @@ class ModXMLRPCRequestHandler(object):
         for call in calls:
             try:
                 result = self._dispatch(call['methodName'], call['params'])
-            except Fault, fault:
+            except Fault as fault:
                 results.append({'faultCode': fault.faultCode, 'faultString': fault.faultString})
             except:
                 # transform unknown exceptions into XML-RPC Faults
diff --git a/hub/rpmdiff b/hub/rpmdiff
index 4536a9d9..59723777 100755
--- a/hub/rpmdiff
+++ b/hub/rpmdiff
@@ -227,7 +227,7 @@ def main():
     ignore_tags = []
     try:
         opts, args = getopt.getopt(sys.argv[1:], "hi:", ["help", "ignore="])
-    except getopt.GetoptError, e:
+    except getopt.GetoptError as e:
         print("Error: %s" % e)
         _usage()
 
diff --git a/koji/__init__.py b/koji/__init__.py
index ef218784..6e4fa456 100644
--- a/koji/__init__.py
+++ b/koji/__init__.py
@@ -475,7 +475,7 @@ def safe_xmlrpc_loads(s):
     """Load xmlrpc data from a string, but catch faults"""
     try:
         return loads(s)
-    except Fault, f:
+    except Fault as f:
         return f
 
 ## BEGIN kojikamid dup
@@ -1582,7 +1582,7 @@ def config_directory_contents(dir_name):
     configs = []
     try:
         conf_dir_contents = os.listdir(dir_name)
-    except OSError, exception:
+    except OSError as exception:
         if exception.errno != errno.ENOENT:
             raise
     else:
@@ -2312,7 +2312,7 @@ class ClientSession(object):
         for i in (0, 1):
             try:
                 return self._sendOneCall(handler, headers, request)
-            except Exception, e:
+            except Exception as e:
                 if i or not is_conn_error(e):
                     raise
                 self.logger.debug("Connection Error: %s", e)
@@ -2405,7 +2405,7 @@ class ClientSession(object):
                 # note that, for logged-in sessions the server should tell us (via a RetryError fault)
                 # if the call cannot be retried. For non-logged-in sessions, all calls should be read-only
                 # and hence retryable.
-                except Fault, fault:
+                except Fault as fault:
                     #try to convert the fault to a known exception
                     err = convertFault(fault)
                     if isinstance(err, ServerOffline):
@@ -2421,7 +2421,7 @@ class ClientSession(object):
                 except (SystemExit, KeyboardInterrupt):
                     #(depending on the python version, these may or may not be subclasses of Exception)
                     raise
-                except Exception, e:
+                except Exception as e:
                     tb_str = ''.join(traceback.format_exception(*sys.exc_info()))
                     self.new_session()
 
diff --git a/koji/auth.py b/koji/auth.py
index c69a5b48..d0dc5f42 100644
--- a/koji/auth.py
+++ b/koji/auth.py
@@ -79,7 +79,7 @@ class Session(object):
         try:
             id = long(args['session-id'][0])
             key = args['session-key'][0]
-        except KeyError, field:
+        except KeyError as field:
             raise koji.AuthError('%s not specified in session args' % field)
         try:
             callnum = args['callnum'][0]
diff --git a/koji/daemon.py b/koji/daemon.py
index 3743d27a..f298abc4 100644
--- a/koji/daemon.py
+++ b/koji/daemon.py
@@ -609,7 +609,7 @@ class TaskManager(object):
                     rootdir = "%s/root" % topdir
                     try:
                         st = os.lstat(rootdir)
-                    except OSError, e:
+                    except OSError as e:
                         if e.errno == errno.ENOENT:
                             rootdir = None
                         else:
@@ -630,13 +630,13 @@ class TaskManager(object):
                     #also remove the config
                     try:
                         os.unlink(data['cfg'])
-                    except OSError, e:
+                    except OSError as e:
                         self.logger.warn("%s: can't remove config: %s" % (desc, e))
                 elif age > 120:
                     if rootdir:
                         try:
                             flist = os.listdir(rootdir)
-                        except OSError, e:
+                        except OSError as e:
                             self.logger.warn("%s: can't list rootdir: %s" % (desc, e))
                             continue
                         if flist:
@@ -864,7 +864,7 @@ class TaskManager(object):
         prefix = "Task %i (pid %i)" % (task_id, pid)
         try:
             (childpid, status) = os.waitpid(pid, os.WNOHANG)
-        except OSError, e:
+        except OSError as e:
             #check errno
             if e.errno != errno.ECHILD:
                 #should not happen
@@ -905,7 +905,7 @@ class TaskManager(object):
 
             try:
                 os.kill(pid, sig)
-            except OSError, e:
+            except OSError as e:
                 # process probably went away, we'll find out on the next iteration
                 self.logger.info('Error sending signal %i to %s (pid %i, taskID %i): %s' %
                                  (sig, execname, pid, task_id, e))
@@ -1194,7 +1194,7 @@ class TaskManager(object):
             self.logger.info("RESPONSE: %r" % response)
             self.session.host.closeTask(handler.id, response)
             return
-        except six.moves.xmlrpc_client.Fault, fault:
+        except six.moves.xmlrpc_client.Fault as fault:
             response = six.moves.xmlrpc_client.dumps(fault)
             tb = ''.join(traceback.format_exception(*sys.exc_info())).replace(r"\n", "\n")
             self.logger.warn("FAULT:\n%s" % tb)
diff --git a/koji/ssl/SSLConnection.py b/koji/ssl/SSLConnection.py
index d854770a..2e53db7d 100644
--- a/koji/ssl/SSLConnection.py
+++ b/koji/ssl/SSLConnection.py
@@ -106,7 +106,7 @@ class SSLConnection:
 
             try:
                 sent = con.send(data, flags)
-            except SSL.SysCallError, e:
+            except SSL.SysCallError as e:
                 if e[0] == 32:      # Broken Pipe
                     self.close()
                     sent = 0
@@ -142,7 +142,7 @@ class SSLConnection:
                 return None
             except SSL.WantReadError:
                 time.sleep(0.2)
-            except SSL.SysCallError, e:
+            except SSL.SysCallError as e:
                 if e.args == (-1, 'Unexpected EOF'):
                     break
                 raise
diff --git a/koji/tasks.py b/koji/tasks.py
index d47fb7a0..41d6b5ee 100644
--- a/koji/tasks.py
+++ b/koji/tasks.py
@@ -240,7 +240,7 @@ class BaseTaskHandler(object):
                                 continue
                             try:
                                 self.session.getTaskResult(task)
-                            except (koji.GenericError, six.moves.xmlrpc_client.Fault), task_error:
+                            except (koji.GenericError, six.moves.xmlrpc_client.Fault) as task_error:
                                 self.logger.info("task %s failed or was canceled" % task)
                                 failed = True
                                 break
diff --git a/koji/util.py b/koji/util.py
index 9fce070e..96d24abf 100644
--- a/koji/util.py
+++ b/koji/util.py
@@ -156,7 +156,7 @@ def call_with_argcheck(func, args, kwargs=None):
         kwargs = {}
     try:
         return func(*args, **kwargs)
-    except TypeError, e:
+    except TypeError as e:
         if sys.exc_info()[2].tb_next is None:
             # The stack is only one high, so the error occurred in this function.
             # Therefore, we assume the TypeError is due to a parameter mismatch
@@ -459,7 +459,7 @@ def setup_rlimits(opts, logger=None):
         logger.warn('Setting resource limit: %s = %r', key, limits)
         try:
             resource.setrlimit(rcode, tuple(limits))
-        except ValueError, e:
+        except ValueError as e:
             logger.error("Unable to set %s: %s", key, e)
 
 class adler32_constructor(object):
diff --git a/util/koji-gc b/util/koji-gc
index fb29d540..4a7e6e31 100755
--- a/util/koji-gc
+++ b/util/koji-gc
@@ -198,7 +198,7 @@ def get_options():
                 if len(parts) < 2:
                     continue
                 options.key_aliases[parts[0].upper()] = parts[1]
-    except ValueError, e:
+    except ValueError as e:
         print(e)
         parser.error(_("Invalid key alias data in config: %s") % config.get('main','key_aliases'))
 
@@ -373,9 +373,9 @@ def activate_session(session):
                 session.krb_login(principal=options.principal, keytab=options.keytab, proxyuser=options.runas)
             else:
                 session.krb_login(proxyuser=options.runas)
-        except krbV.Krb5Error, e:
+        except krbV.Krb5Error as e:
             error(_("Kerberos authentication failed: %s (%s)") % (e.args[1], e.args[0]))
-        except socket.error, e:
+        except socket.error as e:
             warn(_("Could not connect to Kerberos authentication service: '%s'") % e.args[1])
     if not options.noauth and not session.logged_in:
         error(_("Error: unable to log in, no authentication methods available"))
@@ -656,7 +656,7 @@ def handle_delete(just_salvage=False):
             session.untagBuildBypass(trashcan_tag,  binfo['id'])
             try:
                 session.deleteBuild(binfo['id'])
-            except (six.moves.xmlrpc_client.Fault, koji.GenericError), e:
+            except (six.moves.xmlrpc_client.Fault, koji.GenericError) as e:
                 print("Warning: deletion failed: %s" % e)
                 #server issue
                 pass
@@ -875,7 +875,7 @@ def handle_prune():
                         try:
                             session.untagBuildBypass(taginfo['id'], entry['build_id'], force=bypass)
                             untagged.setdefault(nvr, {})[tagname] = 1
-                        except (six.moves.xmlrpc_client.Fault, koji.GenericError), e:
+                        except (six.moves.xmlrpc_client.Fault, koji.GenericError) as e:
                             print("Warning: untag operation failed: %s" % e)
                             pass
                 # if action == 'keep' do nothing
@@ -909,7 +909,7 @@ def handle_prune():
                 print("Deleting untagged build: %s"  % nvr)
                 try:
                     session.deleteBuild(build_id, strict=False)
-                except (six.moves.xmlrpc_client.Fault, koji.GenericError), e:
+                except (six.moves.xmlrpc_client.Fault, koji.GenericError) as e:
                     print("Warning: deletion failed: %s" % e)
                     #server issue
                     pass
diff --git a/util/koji-shadow b/util/koji-shadow
index d17f01c5..0b93b846 100755
--- a/util/koji-shadow
+++ b/util/koji-shadow
@@ -329,9 +329,9 @@ def activate_session(session):
                 session.krb_login(principal=options.principal, keytab=options.keytab, proxyuser=options.runas)
             else:
                 session.krb_login(proxyuser=options.runas)
-        except krbV.Krb5Error, e:
+        except krbV.Krb5Error as e:
             error(_("Kerberos authentication failed: '%s' (%s)") % (e.args[1], e.args[0]))
-        except socket.error, e:
+        except socket.error as e:
             warn(_("Could not connect to Kerberos authentication service: '%s'") % e.args[1])
     if not options.noauth and not session.logged_in:
         error(_("Error: unable to log in"))
diff --git a/util/kojira b/util/kojira
index c09c40bd..a875f291 100755
--- a/util/kojira
+++ b/util/kojira
@@ -146,7 +146,7 @@ class ManagedRepo(object):
             #also check dir age. We do this because a repo can be created from an older event
             #and should not be removed based solely on that event's timestamp.
             mtime = os.stat(path).st_mtime
-        except OSError, e:
+        except OSError as e:
             if e.errno == 2:
                 # No such file or directory, so the repo either never existed,
                 # or has already been deleted, so allow it to be marked deleted.
@@ -226,7 +226,7 @@ class RepoManager(object):
         prefix = "pid %i (%s)" % (pid, self.delete_pids.get(pid))
         try:
             (childpid, status) = os.waitpid(pid, os.WNOHANG)
-        except OSError, e:
+        except OSError as e:
             if e.errno != errno.ECHILD:
                 #should not happen
                 raise
@@ -261,7 +261,7 @@ class RepoManager(object):
         for pid in self.delete_pids:
             try:
                 os.kill(pid, sig)
-            except OSError, e:
+            except OSError as e:
                 if e.errno != errno.ESRCH:
                     logger.error("Unable to kill process %s", pid)