provide six.pkgname to replace __package__

six.py

@@ -928,6 +928,22 @@ def python_2_unicode_compatible(klass):
     return klass
 
 
+def pkgname(globals):
+    """
+    Return the package name of a module.
+
+    On Python 2 under __future__.absolute_import __package__ is None until an
+    explcit relative import is attempted.
+
+    six.pgkname(globals()) is equivalent to __package__ on Python 3.
+    """
+    pkgname_ = globals.get("__package__")
+    if pkgname_ is not None:
+        return pkgname_
+    modname = globals.get("__name__")
+    return modename if "__path__" in globals else modname.rpartition(".")[0]
+
+
 # Complete the moves implementation.
 # This code is at the end of this module to speed up module loading.
 # Turn this module into a package.