Don't worry about moving imp.get_tag() over to Lib/imp.py.
diff --git a/Lib/imp.py b/Lib/imp.py
index dbec8d3..67d85cb 100644
--- a/Lib/imp.py
+++ b/Lib/imp.py
@@ -11,9 +11,9 @@
init_builtin, init_frozen, is_builtin, is_frozen,
_fix_co_filename)
# Could move out of _imp, but not worth the code
-from _imp import get_magic
+from _imp import get_magic, get_tag
# Can (probably) move to importlib
-from _imp import (get_tag, get_suffixes)
+from _imp import get_suffixes
# Should be re-implemented here (and mostly deprecated)
from _imp import (find_module, NullImporter,
SEARCH_ERROR, PY_SOURCE, PY_COMPILED, C_EXTENSION,