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_ast.py b/Lib/test/test_ast.py
index 289b533..24394ed 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -117,11 +117,11 @@
 if __name__=='__main__' and sys.argv[1:] == ['-g']:
     for statements, kind in ((exec_tests, "exec"), (single_tests, "single"),
                              (eval_tests, "eval")):
-        print kind+"_results = ["
+        print(kind+"_results = [")
         for s in statements:
-            print repr(to_tuple(compile(s, "?", kind, 0x400)))+","
-        print "]"
-    print "run_tests()"
+            print(repr(to_tuple(compile(s, "?", kind, 0x400)))+",")
+        print("]")
+    print("run_tests()")
     raise SystemExit
 
 def test_order(ast_node, parent_pos):