Fix most trivially-findable print statements.

There's one major and one minor category still unfixed:
doctests are the major category (and I hope to be able to augment the
refactoring tool to refactor bona fide doctests soon);
other code generating print statements in strings is the minor category.

(Oh, and I don't know if the compiler package works.)

Lib/xml/sax/handler.py

@@ -39,7 +39,7 @@ class ErrorHandler:
 
     def warning(self, exception):
         "Handle a warning."
-        print exception
+        print(exception)
 
 
 # ===== CONTENTHANDLER =====