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/test/test_trace.py

@@ -309,7 +309,7 @@ class RaisingTraceFuncTestCase(unittest.TestCase):
     def test_trash_stack(self):
         def f():
             for i in range(5):
-                print i  # line tracing will raise an exception at this line
+                print(i)  # line tracing will raise an exception at this line
 
         def g(frame, why, extra):
             if (why == 'line' and