Update wiring to support modules provided as packages

Author: rmk135

src/dependency_injector/wiring.py

@@ -552,6 +552,8 @@ def _unbind_injections(fn: Callable[..., Any]) -> None:
 
 def _fetch_modules(package):
     modules = [package]
+    if not hasattr(package, '__path__') or not hasattr(package, '__name__'):
+        return modules
     for module_info in pkgutil.walk_packages(
             path=package.__path__,
             prefix=package.__name__ + '.',

tests/unit/wiring/test_wiring_py36.py

@@ -310,6 +310,18 @@ def test_container(self):
         self.assertIsInstance(service, Service)
 
 
+class ModuleAsPackagingTest(unittest.TestCase):
+
+    def setUp(self):
+        self.container = Container(config={'a': {'b': {'c': 10}}})
+        self.addCleanup(self.container.unwire)
+
+    def test_module_as_package_wiring(self):
+        # See: https://github.com/ets-labs/python-dependency-injector/issues/481
+        self.container.wire(packages=[module])
+        self.assertIsInstance(module.service, Service)
+
+
 class WiringAndQueue(unittest.TestCase):
 
     def test_wire_queue(self) -> None: