Thrift-1784: pep-3110 exception handling
Client: py
Patch: jfarrell

Updates python lib for pep-3110
diff --git a/lib/py/src/server/TProcessPoolServer.py b/lib/py/src/server/TProcessPoolServer.py
index eefb623..ae7fe1c 100644
--- a/lib/py/src/server/TProcessPoolServer.py
+++ b/lib/py/src/server/TProcessPoolServer.py
@@ -63,7 +63,7 @@
                 self.serveClient(client)
             except (KeyboardInterrupt, SystemExit):
                 return 0
-            except Exception, x:
+            except Exception as x:
                 logger.exception(x)
 
     def serveClient(self, client):
@@ -76,9 +76,9 @@
         try:
             while True:
                 self.processor.process(iprot, oprot)
-        except TTransportException, tx:
+        except TTransportException as tx:
             pass
-        except Exception, x:
+        except Exception as x:
             logger.exception(x)
 
         itrans.close()
@@ -99,7 +99,7 @@
                 w.daemon = True
                 w.start()
                 self.workers.append(w)
-            except Exception, x:
+            except Exception as x:
                 logger.exception(x)
 
         # wait until the condition is set by stop()
@@ -110,7 +110,7 @@
                 break
             except (SystemExit, KeyboardInterrupt):
                 break
-            except Exception, x:
+            except Exception as x:
                 logger.exception(x)
 
         self.isRunning.value = False