From 4c14b5de1cf372e963a4378fc6cb2bca36d24eb8 Mon Sep 17 00:00:00 2001 From: Brett Cannon Date: Sat, 4 May 2013 13:56:58 -0400 Subject: #17115,17116: Have modules initialize the __package__ and __loader__ attributes to None. The long-term goal is for people to be able to rely on these attributes existing and checking for None to see if they have been set. Since import itself sets these attributes when a loader does not the only instances when the attributes are None are from someone overloading __import__() and not using a loader or someone creating a module from scratch. This patch also unifies module initialization. Before you could have different attributes with default values depending on how the module object was created. Now the only way to not get the same default set of attributes is to circumvent initialization by calling ModuleType.__new__() directly. --- Doc/c-api/module.rst | 11 +- Doc/library/importlib.rst | 2 +- Doc/reference/import.rst | 4 +- Doc/whatsnew/3.4.rst | 5 + Lib/ctypes/test/__init__.py | 2 +- Lib/doctest.py | 2 +- Lib/importlib/_bootstrap.py | 2 +- Lib/inspect.py | 2 +- Lib/test/test_descr.py | 4 +- Lib/test/test_importlib/test_api.py | 14 +- Lib/test/test_module.py | 28 ++- Misc/NEWS | 3 + Objects/moduleobject.c | 39 ++-- Python/importlib.h | 363 ++++++++++++++++++------------------ Python/pythonrun.c | 3 +- 15 files changed, 264 insertions(+), 220 deletions(-) diff --git a/Doc/c-api/module.rst b/Doc/c-api/module.rst index 65ff8fa..95a0169 100644 --- a/Doc/c-api/module.rst +++ b/Doc/c-api/module.rst @@ -35,13 +35,20 @@ There are only a few functions special to module objects. single: __name__ (module attribute) single: __doc__ (module attribute) single: __file__ (module attribute) + single: __package__ (module attribute) + single: __loader__ (module attribute) Return a new module object with the :attr:`__name__` attribute set to *name*. - Only the module's :attr:`__doc__` and :attr:`__name__` attributes are filled in; - the caller is responsible for providing a :attr:`__file__` attribute. + The module's :attr:`__name__`, :attr:`__doc__`, :attr:`__package__`, and + :attr:`__loader__` attributes are filled in (all but :attr:`__name__` are set + to ``None``); the caller is responsible for providing a :attr:`__file__` + attribute. .. versionadded:: 3.3 + .. versionchanged:: 3.4 + :attr:`__package__` and :attr:`__loader__` are set to ``None``. + .. c:function:: PyObject* PyModule_New(const char *name) diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst index aeeb3fd..9cb03be 100644 --- a/Doc/library/importlib.rst +++ b/Doc/library/importlib.rst @@ -827,7 +827,7 @@ an :term:`importer`. decorator as it subsumes this functionality. .. versionchanged:: 3.4 - Set ``__loader__`` if set to ``None`` as well if the attribute does not + Set ``__loader__`` if set to ``None``, as if the attribute does not exist. diff --git a/Doc/reference/import.rst b/Doc/reference/import.rst index 4ad4490..9c52435 100644 --- a/Doc/reference/import.rst +++ b/Doc/reference/import.rst @@ -423,8 +423,8 @@ Here are the exact rules used: * If the module has a ``__file__`` attribute, this is used as part of the module's repr. - * If the module has no ``__file__`` but does have a ``__loader__``, then the - loader's repr is used as part of the module's repr. + * If the module has no ``__file__`` but does have a ``__loader__`` that is not + ``None``, then the loader's repr is used as part of the module's repr. * Otherwise, just use the module's ``__name__`` in the repr. diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst index ca515f6..9774241 100644 --- a/Doc/whatsnew/3.4.rst +++ b/Doc/whatsnew/3.4.rst @@ -231,3 +231,8 @@ that may require changes to your code. :exc:`NotImplementedError` blindly. This will only affect code calling :func:`super` and falling through all the way to the ABCs. For compatibility, catch both :exc:`NotImplementedError` or the appropriate exception as needed. + +* The module type now initializes the :attr:`__package__` and :attr:`__loader__` + attributes to ``None`` by default. To determine if these attributes were set + in a backwards-compatible fashion, use e.g. + ``getattr(module, '__loader__', None) is not None``. \ No newline at end of file diff --git a/Lib/ctypes/test/__init__.py b/Lib/ctypes/test/__init__.py index cc5fe02..7c72210 100644 --- a/Lib/ctypes/test/__init__.py +++ b/Lib/ctypes/test/__init__.py @@ -37,7 +37,7 @@ def requires(resource, msg=None): def find_package_modules(package, mask): import fnmatch - if (hasattr(package, "__loader__") and + if (package.__loader__ is not None and hasattr(package.__loader__, '_files')): path = package.__name__.replace(".", os.path.sep) mask = os.path.join(path, mask) diff --git a/Lib/doctest.py b/Lib/doctest.py index 16a732d..1b8a9d4 100644 --- a/Lib/doctest.py +++ b/Lib/doctest.py @@ -215,7 +215,7 @@ def _load_testfile(filename, package, module_relative, encoding): if module_relative: package = _normalize_module(package, 3) filename = _module_relative_path(package, filename) - if hasattr(package, '__loader__'): + if getattr(package, '__loader__', None) is not None: if hasattr(package.__loader__, 'get_data'): file_contents = package.__loader__.get_data(filename) file_contents = file_contents.decode(encoding) diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py index 1a046c5..155403e 100644 --- a/Lib/importlib/_bootstrap.py +++ b/Lib/importlib/_bootstrap.py @@ -1726,7 +1726,7 @@ def _setup(sys_module, _imp_module): module_type = type(sys) for name, module in sys.modules.items(): if isinstance(module, module_type): - if not hasattr(module, '__loader__'): + if getattr(module, '__loader__', None) is None: if name in sys.builtin_module_names: module.__loader__ = BuiltinImporter elif _imp.is_frozen(name): diff --git a/Lib/inspect.py b/Lib/inspect.py index e60a235..22b9e84 100644 --- a/Lib/inspect.py +++ b/Lib/inspect.py @@ -476,7 +476,7 @@ def getsourcefile(object): if os.path.exists(filename): return filename # only return a non-existent filename if the module has a PEP 302 loader - if hasattr(getmodule(object, filename), '__loader__'): + if getattr(getmodule(object, filename), '__loader__', None) is not None: return filename # or it is in the linecache if filename in linecache.cache: diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py index d38d1f4..8cb3155 100644 --- a/Lib/test/test_descr.py +++ b/Lib/test/test_descr.py @@ -2250,7 +2250,9 @@ order (MRO) for bases """ minstance = M("m") minstance.b = 2 minstance.a = 1 - names = [x for x in dir(minstance) if x not in ["__name__", "__doc__"]] + default_attributes = ['__name__', '__doc__', '__package__', + '__loader__'] + names = [x for x in dir(minstance) if x not in default_attributes] self.assertEqual(names, ['a', 'b']) class M2(M): diff --git a/Lib/test/test_importlib/test_api.py b/Lib/test/test_importlib/test_api.py index ac88b2b..297d6cb 100644 --- a/Lib/test/test_importlib/test_api.py +++ b/Lib/test/test_importlib/test_api.py @@ -197,14 +197,12 @@ class StartupTests(unittest.TestCase): # Issue #17098: all modules should have __loader__ defined. for name, module in sys.modules.items(): if isinstance(module, types.ModuleType): - if name in sys.builtin_module_names: - self.assertIn(module.__loader__, - (importlib.machinery.BuiltinImporter, - importlib._bootstrap.BuiltinImporter)) - elif imp.is_frozen(name): - self.assertIn(module.__loader__, - (importlib.machinery.FrozenImporter, - importlib._bootstrap.FrozenImporter)) + self.assertTrue(hasattr(module, '__loader__'), + '{!r} lacks a __loader__ attribute'.format(name)) + if importlib.machinery.BuiltinImporter.find_module(name): + self.assertIsNot(module.__loader__, None) + elif importlib.machinery.FrozenImporter.find_module(name): + self.assertIsNot(module.__loader__, None) if __name__ == '__main__': diff --git a/Lib/test/test_module.py b/Lib/test/test_module.py index e5a2525..b34b30f 100644 --- a/Lib/test/test_module.py +++ b/Lib/test/test_module.py @@ -33,7 +33,10 @@ class ModuleTests(unittest.TestCase): foo = ModuleType("foo") self.assertEqual(foo.__name__, "foo") self.assertEqual(foo.__doc__, None) - self.assertEqual(foo.__dict__, {"__name__": "foo", "__doc__": None}) + self.assertIs(foo.__loader__, None) + self.assertIs(foo.__package__, None) + self.assertEqual(foo.__dict__, {"__name__": "foo", "__doc__": None, + "__loader__": None, "__package__": None}) def test_ascii_docstring(self): # ASCII docstring @@ -41,7 +44,8 @@ class ModuleTests(unittest.TestCase): self.assertEqual(foo.__name__, "foo") self.assertEqual(foo.__doc__, "foodoc") self.assertEqual(foo.__dict__, - {"__name__": "foo", "__doc__": "foodoc"}) + {"__name__": "foo", "__doc__": "foodoc", + "__loader__": None, "__package__": None}) def test_unicode_docstring(self): # Unicode docstring @@ -49,7 +53,8 @@ class ModuleTests(unittest.TestCase): self.assertEqual(foo.__name__, "foo") self.assertEqual(foo.__doc__, "foodoc\u1234") self.assertEqual(foo.__dict__, - {"__name__": "foo", "__doc__": "foodoc\u1234"}) + {"__name__": "foo", "__doc__": "foodoc\u1234", + "__loader__": None, "__package__": None}) def test_reinit(self): # Reinitialization should not replace the __dict__ @@ -61,7 +66,8 @@ class ModuleTests(unittest.TestCase): self.assertEqual(foo.__doc__, "foodoc") self.assertEqual(foo.bar, 42) self.assertEqual(foo.__dict__, - {"__name__": "foo", "__doc__": "foodoc", "bar": 42}) + {"__name__": "foo", "__doc__": "foodoc", "bar": 42, + "__loader__": None, "__package__": None}) self.assertTrue(foo.__dict__ is d) @unittest.expectedFailure @@ -110,13 +116,19 @@ a = A(destroyed)""" m.__file__ = '/tmp/foo.py' self.assertEqual(repr(m), "") + def test_module_repr_with_loader_as_None(self): + m = ModuleType('foo') + assert m.__loader__ is None + self.assertEqual(repr(m), "") + def test_module_repr_with_bare_loader_but_no_name(self): m = ModuleType('foo') del m.__name__ # Yes, a class not an instance. m.__loader__ = BareLoader + loader_repr = repr(BareLoader) self.assertEqual( - repr(m), ")>") + repr(m), "".format(loader_repr)) def test_module_repr_with_full_loader_but_no_name(self): # m.__loader__.module_repr() will fail because the module has no @@ -126,15 +138,17 @@ a = A(destroyed)""" del m.__name__ # Yes, a class not an instance. m.__loader__ = FullLoader + loader_repr = repr(FullLoader) self.assertEqual( - repr(m), ")>") + repr(m), "".format(loader_repr)) def test_module_repr_with_bare_loader(self): m = ModuleType('foo') # Yes, a class not an instance. m.__loader__ = BareLoader + module_repr = repr(BareLoader) self.assertEqual( - repr(m), ")>") + repr(m), "".format(module_repr)) def test_module_repr_with_full_loader(self): m = ModuleType('foo') diff --git a/Misc/NEWS b/Misc/NEWS index 524c84b..8d4c276 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -10,6 +10,9 @@ What's New in Python 3.4.0 Alpha 1? Core and Builtins ----------------- +- Issue #17115,17116: Module initialization now includes setting __package__ and + __loader__ attributes to None. + - Issue #17853: Ensure locals of a class that shadow free variables always win over the closures. diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c index 2f2bd36..5970901 100644 --- a/Objects/moduleobject.c +++ b/Objects/moduleobject.c @@ -26,6 +26,27 @@ static PyTypeObject moduledef_type = { }; +static int +module_init_dict(PyObject *md_dict, PyObject *name, PyObject *doc) +{ + if (md_dict == NULL) + return -1; + if (doc == NULL) + doc = Py_None; + + if (PyDict_SetItemString(md_dict, "__name__", name) != 0) + return -1; + if (PyDict_SetItemString(md_dict, "__doc__", doc) != 0) + return -1; + if (PyDict_SetItemString(md_dict, "__package__", Py_None) != 0) + return -1; + if (PyDict_SetItemString(md_dict, "__loader__", Py_None) != 0) + return -1; + + return 0; +} + + PyObject * PyModule_NewObject(PyObject *name) { @@ -36,13 +57,7 @@ PyModule_NewObject(PyObject *name) m->md_def = NULL; m->md_state = NULL; m->md_dict = PyDict_New(); - if (m->md_dict == NULL) - goto fail; - if (PyDict_SetItemString(m->md_dict, "__name__", name) != 0) - goto fail; - if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0) - goto fail; - if (PyDict_SetItemString(m->md_dict, "__package__", Py_None) != 0) + if (module_init_dict(m->md_dict, name, NULL) != 0) goto fail; PyObject_GC_Track(m); return (PyObject *)m; @@ -347,9 +362,7 @@ module_init(PyModuleObject *m, PyObject *args, PyObject *kwds) return -1; m->md_dict = dict; } - if (PyDict_SetItemString(dict, "__name__", name) < 0) - return -1; - if (PyDict_SetItemString(dict, "__doc__", doc) < 0) + if (module_init_dict(dict, name, doc) < 0) return -1; return 0; } @@ -380,7 +393,7 @@ module_repr(PyModuleObject *m) if (m->md_dict != NULL) { loader = PyDict_GetItemString(m->md_dict, "__loader__"); } - if (loader != NULL) { + if (loader != NULL && loader != Py_None) { repr = PyObject_CallMethod(loader, "module_repr", "(O)", (PyObject *)m, NULL); if (repr == NULL) { @@ -404,10 +417,10 @@ module_repr(PyModuleObject *m) filename = PyModule_GetFilenameObject((PyObject *)m); if (filename == NULL) { PyErr_Clear(); - /* There's no m.__file__, so if there was an __loader__, use that in + /* There's no m.__file__, so if there was a __loader__, use that in * the repr, otherwise, the only thing you can use is m.__name__ */ - if (loader == NULL) { + if (loader == NULL || loader == Py_None) { repr = PyUnicode_FromFormat("", name); } else { diff --git a/Python/importlib.h b/Python/importlib.h index ed5bcf5..b3cd548 100644 --- a/Python/importlib.h +++ b/Python/importlib.h @@ -3354,189 +3354,190 @@ const unsigned char _Py_M__importlib[] = { 115,26,0,0,0,0,11,12,1,15,2,24,1,12,1,18, 1,6,3,12,1,23,1,6,1,4,4,35,3,40,2,114, 77,1,0,0,99,2,0,0,0,0,0,0,0,16,0,0, - 0,13,0,0,0,67,0,0,0,115,228,2,0,0,124,1, + 0,13,0,0,0,67,0,0,0,115,237,2,0,0,124,1, 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