Modify examples to be both Python 2 and 3 compatible

For removing dependency on 2to3

Examples/python/exception/runme.py

@@ -7,36 +7,36 @@ import example
 t = example.Test()
 try:
     t.unknown()
-except RuntimeError, e:
-    print "incomplete type", e.args[0]
+except RuntimeError as e:
+    print("incomplete type %s" % e.args[0])
 
 try:
     t.simple()
-except RuntimeError, e:
-    print e.args[0]
+except RuntimeError as e:
+    print(e.args[0])
 
 try:
     t.message()
-except RuntimeError, e:
-    print e.args[0]
+except RuntimeError as e:
+    print(e.args[0])
 
 if not example.is_python_builtin():
     try:
         t.hosed()
-    except example.Exc, e:
-        print e.code, e.msg
+    except example.Exc as e:
+        print("%s %s" % (e.code, e.msg))
 else:
     try:
         t.hosed()
-    except BaseException, e:
+    except BaseException as e:
         # Throwing builtin classes as exceptions not supported (-builtin
         # option)
-        print e
+        print(e)
 
 for i in range(1, 4):
     try:
         t.multi(i)
-    except RuntimeError, e:
-        print e.args[0]
-    except example.Exc, e:
-        print e.code, e.msg
+    except RuntimeError as e:
+        print(e.args[0])
+    except example.Exc as e:
+        print("%s %s" % (e.code, e.msg))