Print byte-compilation level for debug

JGoutin · web-flow · commit 5f395e0a3502 · 2016-07-12T20:32:42.000+02:00
Help see if `.travis.yml` work as intended.
diff --git a/tests.py b/tests.py
@@ -53,4 +53,6 @@ def run(extra_args):
         extra_args.extend(['-a', '!network'])
         sys.argv.remove('--no-network')
 
+    print('Python byte-compilation optimization level: %d' % sys.flags.optimize)
+
     run(extra_args)
