import a.b.c⇒ ImportError: No module named 'a.b.c'; 'a.b' is not a packageimport a.ba ⇒ <module 'a' (namespace)>a.__path__ ⇒ _NamespacePath(['/.../a'])a.b ⇒ <module 'a.b' from '/home/cjs/tmp/a/b.py'>a.b.__path__ ⇒ AttributeError: 'module' object has no attribute '__path__'