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.)
diff --git a/Lib/test/test_curses.py b/Lib/test/test_curses.py
index 4022149..fd8e6ed 100644
--- a/Lib/test/test_curses.py
+++ b/Lib/test/test_curses.py
@@ -228,7 +228,7 @@
                          ('\x8a', '!^J'), ('\xc1', '!A'),
                          ]:
         if ascii.unctrl(ch) != expected:
-            print 'curses.unctrl fails on character', repr(ch)
+            print('curses.unctrl fails on character', repr(ch))
 
 
 def test_userptr_without_set(stdscr):