[backport] PR-8535 - ENH: Enable relative import of Slicer Python-wrapped libraries

Author: Thibault-Pelletier

Base/Python/slicer/__init__.py

@@ -195,7 +195,11 @@ def _createModule(name, globals, docstring):
     try:
         exec("from %s import *" % (kit))
     except ImportError as detail:
-        print(detail)
+        # Try kit relative import if installed in as a traditional package
+        try:
+            exec("from .%s import *" % (kit))
+        except ImportError:
+            print(detail)
 
     del kit