| from test import test_support | |
| import types | |
| import unittest | |
| class FuncAttrsTest(unittest.TestCase): | |
| def setUp(self): | |
| class F: | |
| def a(self): | |
| pass | |
| def b(): | |
| return 3 | |
| self.f = F | |
| self.fi = F() | |
| self.b = b | |
| def cannot_set_attr(self, obj, name, value, exceptions): | |
| # Helper method for other tests. | |
| try: | |
| setattr(obj, name, value) | |
| except exceptions: | |
| pass | |
| else: | |
| self.fail("shouldn't be able to set %s to %r" % (name, value)) | |
| try: | |
| delattr(obj, name) | |
| except exceptions: | |
| pass | |
| else: | |
| self.fail("shouldn't be able to del %s" % name) | |
| class FunctionPropertiesTest(FuncAttrsTest): | |
| # Include the external setUp method that is common to all tests | |
| def test_module(self): | |
| self.assertEqual(self.b.__module__, __name__) | |
| def test_dir_includes_correct_attrs(self): | |
| self.b.known_attr = 7 | |
| self.assertIn('known_attr', dir(self.b), | |
| "set attributes not in dir listing of method") | |
| # Test on underlying function object of method | |
| self.f.a.im_func.known_attr = 7 | |
| self.assertIn('known_attr', dir(self.f.a), | |
| "set attribute on unbound method implementation in " | |
| "class not in dir") | |
| self.assertIn('known_attr', dir(self.fi.a), | |
| "set attribute on unbound method implementations, " | |
| "should show up in next dir") | |
| def test_duplicate_function_equality(self): | |
| # Body of `duplicate' is the exact same as self.b | |
| def duplicate(): | |
| 'my docstring' | |
| return 3 | |
| self.assertNotEqual(self.b, duplicate) | |
| def test_copying_func_code(self): | |
| def test(): pass | |
| self.assertEqual(test(), None) | |
| test.func_code = self.b.func_code | |
| self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily | |
| def test_func_globals(self): | |
| self.assertIs(self.b.func_globals, globals()) | |
| self.cannot_set_attr(self.b, 'func_globals', 2, TypeError) | |
| def test_func_closure(self): | |
| a = 12 | |
| def f(): print a | |
| c = f.func_closure | |
| self.assertIsInstance(c, tuple) | |
| self.assertEqual(len(c), 1) | |
| # don't have a type object handy | |
| self.assertEqual(c[0].__class__.__name__, "cell") | |
| self.cannot_set_attr(f, "func_closure", c, TypeError) | |
| def test_empty_cell(self): | |
| def f(): print a | |
| try: | |
| f.func_closure[0].cell_contents | |
| except ValueError: | |
| pass | |
| else: | |
| self.fail("shouldn't be able to read an empty cell") | |
| a = 12 | |
| def test_func_name(self): | |
| self.assertEqual(self.b.__name__, 'b') | |
| self.assertEqual(self.b.func_name, 'b') | |
| self.b.__name__ = 'c' | |
| self.assertEqual(self.b.__name__, 'c') | |
| self.assertEqual(self.b.func_name, 'c') | |
| self.b.func_name = 'd' | |
| self.assertEqual(self.b.__name__, 'd') | |
| self.assertEqual(self.b.func_name, 'd') | |
| # __name__ and func_name must be a string | |
| self.cannot_set_attr(self.b, '__name__', 7, TypeError) | |
| self.cannot_set_attr(self.b, 'func_name', 7, TypeError) | |
| # __name__ must be available when in restricted mode. Exec will raise | |
| # AttributeError if __name__ is not available on f. | |
| s = """def f(): pass\nf.__name__""" | |
| exec s in {'__builtins__': {}} | |
| # Test on methods, too | |
| self.assertEqual(self.f.a.__name__, 'a') | |
| self.assertEqual(self.fi.a.__name__, 'a') | |
| self.cannot_set_attr(self.f.a, "__name__", 'a', AttributeError) | |
| self.cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError) | |
| def test_func_code(self): | |
| num_one, num_two = 7, 8 | |
| def a(): pass | |
| def b(): return 12 | |
| def c(): return num_one | |
| def d(): return num_two | |
| def e(): return num_one, num_two | |
| for func in [a, b, c, d, e]: | |
| self.assertEqual(type(func.func_code), types.CodeType) | |
| self.assertEqual(c(), 7) | |
| self.assertEqual(d(), 8) | |
| d.func_code = c.func_code | |
| self.assertEqual(c.func_code, d.func_code) | |
| self.assertEqual(c(), 7) | |
| # self.assertEqual(d(), 7) | |
| try: | |
| b.func_code = c.func_code | |
| except ValueError: | |
| pass | |
| else: | |
| self.fail("func_code with different numbers of free vars should " | |
| "not be possible") | |
| try: | |
| e.func_code = d.func_code | |
| except ValueError: | |
| pass | |
| else: | |
| self.fail("func_code with different numbers of free vars should " | |
| "not be possible") | |
| def test_blank_func_defaults(self): | |
| self.assertEqual(self.b.func_defaults, None) | |
| del self.b.func_defaults | |
| self.assertEqual(self.b.func_defaults, None) | |
| def test_func_default_args(self): | |
| def first_func(a, b): | |
| return a+b | |
| def second_func(a=1, b=2): | |
| return a+b | |
| self.assertEqual(first_func.func_defaults, None) | |
| self.assertEqual(second_func.func_defaults, (1, 2)) | |
| first_func.func_defaults = (1, 2) | |
| self.assertEqual(first_func.func_defaults, (1, 2)) | |
| self.assertEqual(first_func(), 3) | |
| self.assertEqual(first_func(3), 5) | |
| self.assertEqual(first_func(3, 5), 8) | |
| del second_func.func_defaults | |
| self.assertEqual(second_func.func_defaults, None) | |
| try: | |
| second_func() | |
| except TypeError: | |
| pass | |
| else: | |
| self.fail("func_defaults does not update; deleting it does not " | |
| "remove requirement") | |
| class InstancemethodAttrTest(FuncAttrsTest): | |
| def test_im_class(self): | |
| self.assertEqual(self.f.a.im_class, self.f) | |
| self.assertEqual(self.fi.a.im_class, self.f) | |
| self.cannot_set_attr(self.f.a, "im_class", self.f, TypeError) | |
| self.cannot_set_attr(self.fi.a, "im_class", self.f, TypeError) | |
| def test_im_func(self): | |
| self.f.b = self.b | |
| self.assertEqual(self.f.b.im_func, self.b) | |
| self.assertEqual(self.fi.b.im_func, self.b) | |
| self.cannot_set_attr(self.f.b, "im_func", self.b, TypeError) | |
| self.cannot_set_attr(self.fi.b, "im_func", self.b, TypeError) | |
| def test_im_self(self): | |
| self.assertEqual(self.f.a.im_self, None) | |
| self.assertEqual(self.fi.a.im_self, self.fi) | |
| self.cannot_set_attr(self.f.a, "im_self", None, TypeError) | |
| self.cannot_set_attr(self.fi.a, "im_self", self.fi, TypeError) | |
| def test_im_func_non_method(self): | |
| # Behavior should be the same when a method is added via an attr | |
| # assignment | |
| self.f.id = types.MethodType(id, None, self.f) | |
| self.assertEqual(self.fi.id(), id(self.fi)) | |
| self.assertNotEqual(self.fi.id(), id(self.f)) | |
| # Test usage | |
| try: | |
| self.f.id.unknown_attr | |
| except AttributeError: | |
| pass | |
| else: | |
| self.fail("using unknown attributes should raise AttributeError") | |
| # Test assignment and deletion | |
| self.cannot_set_attr(self.f.id, 'unknown_attr', 2, AttributeError) | |
| self.cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError) | |
| def test_implicit_method_properties(self): | |
| self.f.a.im_func.known_attr = 7 | |
| self.assertEqual(self.f.a.known_attr, 7) | |
| self.assertEqual(self.fi.a.known_attr, 7) | |
| class ArbitraryFunctionAttrTest(FuncAttrsTest): | |
| def test_set_attr(self): | |
| # setting attributes only works on function objects | |
| self.b.known_attr = 7 | |
| self.assertEqual(self.b.known_attr, 7) | |
| for func in [self.f.a, self.fi.a]: | |
| try: | |
| func.known_attr = 7 | |
| except AttributeError: | |
| pass | |
| else: | |
| self.fail("setting attributes on methods should raise error") | |
| def test_delete_unknown_attr(self): | |
| try: | |
| del self.b.unknown_attr | |
| except AttributeError: | |
| pass | |
| else: | |
| self.fail("deleting unknown attribute should raise TypeError") | |
| def test_setting_attrs_duplicates(self): | |
| try: | |
| self.f.a.klass = self.f | |
| except AttributeError: | |
| pass | |
| else: | |
| self.fail("setting arbitrary attribute in unbound function " | |
| " should raise AttributeError") | |
| self.f.a.im_func.klass = self.f | |
| for method in [self.f.a, self.fi.a, self.fi.a.im_func]: | |
| self.assertEqual(method.klass, self.f) | |
| def test_unset_attr(self): | |
| for func in [self.b, self.f.a, self.fi.a]: | |
| try: | |
| func.non_existent_attr | |
| except AttributeError: | |
| pass | |
| else: | |
| self.fail("using unknown attributes should raise " | |
| "AttributeError") | |
| class FunctionDictsTest(FuncAttrsTest): | |
| def test_setting_dict_to_invalid(self): | |
| self.cannot_set_attr(self.b, '__dict__', None, TypeError) | |
| self.cannot_set_attr(self.b, 'func_dict', None, TypeError) | |
| from UserDict import UserDict | |
| d = UserDict({'known_attr': 7}) | |
| self.cannot_set_attr(self.f.a.im_func, '__dict__', d, TypeError) | |
| self.cannot_set_attr(self.fi.a.im_func, '__dict__', d, TypeError) | |
| def test_setting_dict_to_valid(self): | |
| d = {'known_attr': 7} | |
| self.b.__dict__ = d | |
| # Setting dict is only possible on the underlying function objects | |
| self.f.a.im_func.__dict__ = d | |
| # Test assignment | |
| self.assertIs(d, self.b.__dict__) | |
| self.assertIs(d, self.b.func_dict) | |
| # ... and on all the different ways of referencing the method's func | |
| self.assertIs(d, self.f.a.im_func.__dict__) | |
| self.assertIs(d, self.f.a.__dict__) | |
| self.assertIs(d, self.fi.a.im_func.__dict__) | |
| self.assertIs(d, self.fi.a.__dict__) | |
| # Test value | |
| self.assertEqual(self.b.known_attr, 7) | |
| self.assertEqual(self.b.__dict__['known_attr'], 7) | |
| self.assertEqual(self.b.func_dict['known_attr'], 7) | |
| # ... and again, on all the different method's names | |
| self.assertEqual(self.f.a.im_func.known_attr, 7) | |
| self.assertEqual(self.f.a.known_attr, 7) | |
| self.assertEqual(self.fi.a.im_func.known_attr, 7) | |
| self.assertEqual(self.fi.a.known_attr, 7) | |
| def test_delete_func_dict(self): | |
| try: | |
| del self.b.__dict__ | |
| except TypeError: | |
| pass | |
| else: | |
| self.fail("deleting function dictionary should raise TypeError") | |
| try: | |
| del self.b.func_dict | |
| except TypeError: | |
| pass | |
| else: | |
| self.fail("deleting function dictionary should raise TypeError") | |
| def test_unassigned_dict(self): | |
| self.assertEqual(self.b.__dict__, {}) | |
| def test_func_as_dict_key(self): | |
| value = "Some string" | |
| d = {} | |
| d[self.b] = value | |
| self.assertEqual(d[self.b], value) | |
| class FunctionDocstringTest(FuncAttrsTest): | |
| def test_set_docstring_attr(self): | |
| self.assertEqual(self.b.__doc__, None) | |
| self.assertEqual(self.b.func_doc, None) | |
| docstr = "A test method that does nothing" | |
| self.b.__doc__ = self.f.a.im_func.__doc__ = docstr | |
| self.assertEqual(self.b.__doc__, docstr) | |
| self.assertEqual(self.b.func_doc, docstr) | |
| self.assertEqual(self.f.a.__doc__, docstr) | |
| self.assertEqual(self.fi.a.__doc__, docstr) | |
| self.cannot_set_attr(self.f.a, "__doc__", docstr, AttributeError) | |
| self.cannot_set_attr(self.fi.a, "__doc__", docstr, AttributeError) | |
| def test_delete_docstring(self): | |
| self.b.__doc__ = "The docstring" | |
| del self.b.__doc__ | |
| self.assertEqual(self.b.__doc__, None) | |
| self.assertEqual(self.b.func_doc, None) | |
| self.b.func_doc = "The docstring" | |
| del self.b.func_doc | |
| self.assertEqual(self.b.__doc__, None) | |
| self.assertEqual(self.b.func_doc, None) | |
| class StaticMethodAttrsTest(unittest.TestCase): | |
| def test_func_attribute(self): | |
| def f(): | |
| pass | |
| c = classmethod(f) | |
| self.assertTrue(c.__func__ is f) | |
| s = staticmethod(f) | |
| self.assertTrue(s.__func__ is f) | |
| def test_main(): | |
| test_support.run_unittest(FunctionPropertiesTest, InstancemethodAttrTest, | |
| ArbitraryFunctionAttrTest, FunctionDictsTest, | |
| FunctionDocstringTest, | |
| StaticMethodAttrsTest) | |
| if __name__ == "__main__": | |
| test_main() |