Finally add a test tag "py3only" for tests that should be excluded in Py2.

1 files changed, 1 insertions, 0 deletions

diff --git a/runtests.py b/runtests.py
index 8d7a6efde..35d6522f3 100755
--- a/runtests.py
+++ b/runtests.py
@@ -382,6 +382,7 @@ EXT_EXTRAS = {
     'tag:trace' : update_linetrace_extension,
     'tag:bytesformat':  exclude_extension_in_pyver((3, 3), (3, 4)),  # no %-bytes formatting
     'tag:no-macos':  exclude_extension_on_platform('darwin'),
+    'tag:py3only':  exclude_extension_in_pyver((2, 7)),
 }