| # We import importlib *ASAP* in order to test #15386 |
| import importlib |
| import importlib.util |
| from importlib._bootstrap_external import _get_sourcefile |
| import builtins |
| import marshal |
| import os |
| import py_compile |
| import random |
| import shutil |
| import subprocess |
| import stat |
| import sys |
| import threading |
| import time |
| import unittest |
| import unittest.mock as mock |
| import textwrap |
| import errno |
| import contextlib |
| import glob |
| |
| import test.support |
| from test.support import ( |
| TESTFN, forget, is_jython, |
| make_legacy_pyc, rmtree, swap_attr, swap_item, temp_umask, |
| unlink, unload, cpython_only, TESTFN_UNENCODABLE, |
| temp_dir, DirsOnSysPath) |
| from test.support import script_helper |
| from test.test_importlib.util import uncache |
| |
| |
| skip_if_dont_write_bytecode = unittest.skipIf( |
| sys.dont_write_bytecode, |
| "test meaningful only when writing bytecode") |
| |
| def remove_files(name): |
| for f in (name + ".py", |
| name + ".pyc", |
| name + ".pyw", |
| name + "$py.class"): |
| unlink(f) |
| rmtree('__pycache__') |
| |
| |
| @contextlib.contextmanager |
| def _ready_to_import(name=None, source=""): |
| # sets up a temporary directory and removes it |
| # creates the module file |
| # temporarily clears the module from sys.modules (if any) |
| # reverts or removes the module when cleaning up |
| name = name or "spam" |
| with temp_dir() as tempdir: |
| path = script_helper.make_script(tempdir, name, source) |
| old_module = sys.modules.pop(name, None) |
| try: |
| sys.path.insert(0, tempdir) |
| yield name, path |
| sys.path.remove(tempdir) |
| finally: |
| if old_module is not None: |
| sys.modules[name] = old_module |
| elif name in sys.modules: |
| del sys.modules[name] |
| |
| |
| class ImportTests(unittest.TestCase): |
| |
| def setUp(self): |
| remove_files(TESTFN) |
| importlib.invalidate_caches() |
| |
| def tearDown(self): |
| unload(TESTFN) |
| |
| def test_import_raises_ModuleNotFoundError(self): |
| with self.assertRaises(ModuleNotFoundError): |
| import something_that_should_not_exist_anywhere |
| |
| def test_from_import_missing_module_raises_ModuleNotFoundError(self): |
| with self.assertRaises(ModuleNotFoundError): |
| from something_that_should_not_exist_anywhere import blah |
| |
| def test_from_import_missing_attr_raises_ImportError(self): |
| with self.assertRaises(ImportError): |
| from importlib import something_that_should_not_exist_anywhere |
| |
| def test_from_import_missing_attr_has_name_and_path(self): |
| with self.assertRaises(ImportError) as cm: |
| from os import i_dont_exist |
| self.assertEqual(cm.exception.name, 'os') |
| self.assertEqual(cm.exception.path, os.__file__) |
| self.assertRegex(str(cm.exception), r"cannot import name 'i_dont_exist' from 'os' \(.*os.py\)") |
| |
| @cpython_only |
| def test_from_import_missing_attr_has_name_and_so_path(self): |
| import _testcapi |
| with self.assertRaises(ImportError) as cm: |
| from _testcapi import i_dont_exist |
| self.assertEqual(cm.exception.name, '_testcapi') |
| self.assertEqual(cm.exception.path, _testcapi.__file__) |
| self.assertRegex(str(cm.exception), r"cannot import name 'i_dont_exist' from '_testcapi' \(.*\.(so|pyd)\)") |
| |
| def test_from_import_missing_attr_has_name(self): |
| with self.assertRaises(ImportError) as cm: |
| # _warning has no path as it's a built-in module. |
| from _warning import i_dont_exist |
| self.assertEqual(cm.exception.name, '_warning') |
| self.assertIsNone(cm.exception.path) |
| |
| def test_from_import_missing_attr_path_is_canonical(self): |
| with self.assertRaises(ImportError) as cm: |
| from os.path import i_dont_exist |
| self.assertIn(cm.exception.name, {'posixpath', 'ntpath'}) |
| self.assertIsNotNone(cm.exception) |
| |
| def test_from_import_star_invalid_type(self): |
| import re |
| with _ready_to_import() as (name, path): |
| with open(path, 'w') as f: |
| f.write("__all__ = [b'invalid_type']") |
| globals = {} |
| with self.assertRaisesRegex( |
| TypeError, f"{re.escape(name)}\\.__all__ must be str" |
| ): |
| exec(f"from {name} import *", globals) |
| self.assertNotIn(b"invalid_type", globals) |
| with _ready_to_import() as (name, path): |
| with open(path, 'w') as f: |
| f.write("globals()[b'invalid_type'] = object()") |
| globals = {} |
| with self.assertRaisesRegex( |
| TypeError, f"{re.escape(name)}\\.__dict__ must be str" |
| ): |
| exec(f"from {name} import *", globals) |
| self.assertNotIn(b"invalid_type", globals) |
| |
| def test_case_sensitivity(self): |
| # Brief digression to test that import is case-sensitive: if we got |
| # this far, we know for sure that "random" exists. |
| with self.assertRaises(ImportError): |
| import RAnDoM |
| |
| def test_double_const(self): |
| # Another brief digression to test the accuracy of manifest float |
| # constants. |
| from test import double_const # don't blink -- that *was* the test |
| |
| def test_import(self): |
| def test_with_extension(ext): |
| # The extension is normally ".py", perhaps ".pyw". |
| source = TESTFN + ext |
| if is_jython: |
| pyc = TESTFN + "$py.class" |
| else: |
| pyc = TESTFN + ".pyc" |
| |
| with open(source, "w") as f: |
| print("# This tests Python's ability to import a", |
| ext, "file.", file=f) |
| a = random.randrange(1000) |
| b = random.randrange(1000) |
| print("a =", a, file=f) |
| print("b =", b, file=f) |
| |
| if TESTFN in sys.modules: |
| del sys.modules[TESTFN] |
| importlib.invalidate_caches() |
| try: |
| try: |
| mod = __import__(TESTFN) |
| except ImportError as err: |
| self.fail("import from %s failed: %s" % (ext, err)) |
| |
| self.assertEqual(mod.a, a, |
| "module loaded (%s) but contents invalid" % mod) |
| self.assertEqual(mod.b, b, |
| "module loaded (%s) but contents invalid" % mod) |
| finally: |
| forget(TESTFN) |
| unlink(source) |
| unlink(pyc) |
| |
| sys.path.insert(0, os.curdir) |
| try: |
| test_with_extension(".py") |
| if sys.platform.startswith("win"): |
| for ext in [".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw"]: |
| test_with_extension(ext) |
| finally: |
| del sys.path[0] |
| |
| def test_module_with_large_stack(self, module='longlist'): |
| # Regression test for http://bugs.python.org/issue561858. |
| filename = module + '.py' |
| |
| # Create a file with a list of 65000 elements. |
| with open(filename, 'w') as f: |
| f.write('d = [\n') |
| for i in range(65000): |
| f.write('"",\n') |
| f.write(']') |
| |
| try: |
| # Compile & remove .py file; we only need .pyc. |
| # Bytecode must be relocated from the PEP 3147 bytecode-only location. |
| py_compile.compile(filename) |
| finally: |
| unlink(filename) |
| |
| # Need to be able to load from current dir. |
| sys.path.append('') |
| importlib.invalidate_caches() |
| |
| namespace = {} |
| try: |
| make_legacy_pyc(filename) |
| # This used to crash. |
| exec('import ' + module, None, namespace) |
| finally: |
| # Cleanup. |
| del sys.path[-1] |
| unlink(filename + 'c') |
| unlink(filename + 'o') |
| |
| # Remove references to the module (unload the module) |
| namespace.clear() |
| try: |
| del sys.modules[module] |
| except KeyError: |
| pass |
| |
| def test_failing_import_sticks(self): |
| source = TESTFN + ".py" |
| with open(source, "w") as f: |
| print("a = 1/0", file=f) |
| |
| # New in 2.4, we shouldn't be able to import that no matter how often |
| # we try. |
| sys.path.insert(0, os.curdir) |
| importlib.invalidate_caches() |
| if TESTFN in sys.modules: |
| del sys.modules[TESTFN] |
| try: |
| for i in [1, 2, 3]: |
| self.assertRaises(ZeroDivisionError, __import__, TESTFN) |
| self.assertNotIn(TESTFN, sys.modules, |
| "damaged module in sys.modules on %i try" % i) |
| finally: |
| del sys.path[0] |
| remove_files(TESTFN) |
| |
| def test_import_name_binding(self): |
| # import x.y.z binds x in the current namespace |
| import test as x |
| import test.support |
| self.assertIs(x, test, x.__name__) |
| self.assertTrue(hasattr(test.support, "__file__")) |
| |
| # import x.y.z as w binds z as w |
| import test.support as y |
| self.assertIs(y, test.support, y.__name__) |
| |
| def test_issue31286(self): |
| # import in a 'finally' block resulted in SystemError |
| try: |
| x = ... |
| finally: |
| import test.support.script_helper as x |
| |
| # import in a 'while' loop resulted in stack overflow |
| i = 0 |
| while i < 10: |
| import test.support.script_helper as x |
| i += 1 |
| |
| # import in a 'for' loop resulted in segmentation fault |
| for i in range(2): |
| import test.support.script_helper as x |
| |
| def test_failing_reload(self): |
| # A failing reload should leave the module object in sys.modules. |
| source = TESTFN + os.extsep + "py" |
| with open(source, "w") as f: |
| f.write("a = 1\nb=2\n") |
| |
| sys.path.insert(0, os.curdir) |
| try: |
| mod = __import__(TESTFN) |
| self.assertIn(TESTFN, sys.modules) |
| self.assertEqual(mod.a, 1, "module has wrong attribute values") |
| self.assertEqual(mod.b, 2, "module has wrong attribute values") |
| |
| # On WinXP, just replacing the .py file wasn't enough to |
| # convince reload() to reparse it. Maybe the timestamp didn't |
| # move enough. We force it to get reparsed by removing the |
| # compiled file too. |
| remove_files(TESTFN) |
| |
| # Now damage the module. |
| with open(source, "w") as f: |
| f.write("a = 10\nb=20//0\n") |
| |
| self.assertRaises(ZeroDivisionError, importlib.reload, mod) |
| # But we still expect the module to be in sys.modules. |
| mod = sys.modules.get(TESTFN) |
| self.assertIsNotNone(mod, "expected module to be in sys.modules") |
| |
| # We should have replaced a w/ 10, but the old b value should |
| # stick. |
| self.assertEqual(mod.a, 10, "module has wrong attribute values") |
| self.assertEqual(mod.b, 2, "module has wrong attribute values") |
| |
| finally: |
| del sys.path[0] |
| remove_files(TESTFN) |
| unload(TESTFN) |
| |
| @skip_if_dont_write_bytecode |
| def test_file_to_source(self): |
| # check if __file__ points to the source file where available |
| source = TESTFN + ".py" |
| with open(source, "w") as f: |
| f.write("test = None\n") |
| |
| sys.path.insert(0, os.curdir) |
| try: |
| mod = __import__(TESTFN) |
| self.assertTrue(mod.__file__.endswith('.py')) |
| os.remove(source) |
| del sys.modules[TESTFN] |
| make_legacy_pyc(source) |
| importlib.invalidate_caches() |
| mod = __import__(TESTFN) |
| base, ext = os.path.splitext(mod.__file__) |
| self.assertEqual(ext, '.pyc') |
| finally: |
| del sys.path[0] |
| remove_files(TESTFN) |
| if TESTFN in sys.modules: |
| del sys.modules[TESTFN] |
| |
| def test_import_by_filename(self): |
| path = os.path.abspath(TESTFN) |
| encoding = sys.getfilesystemencoding() |
| try: |
| path.encode(encoding) |
| except UnicodeEncodeError: |
| self.skipTest('path is not encodable to {}'.format(encoding)) |
| with self.assertRaises(ImportError) as c: |
| __import__(path) |
| |
| def test_import_in_del_does_not_crash(self): |
| # Issue 4236 |
| testfn = script_helper.make_script('', TESTFN, textwrap.dedent("""\ |
| import sys |
| class C: |
| def __del__(self): |
| import importlib |
| sys.argv.insert(0, C()) |
| """)) |
| script_helper.assert_python_ok(testfn) |
| |
| @skip_if_dont_write_bytecode |
| def test_timestamp_overflow(self): |
| # A modification timestamp larger than 2**32 should not be a problem |
| # when importing a module (issue #11235). |
| sys.path.insert(0, os.curdir) |
| try: |
| source = TESTFN + ".py" |
| compiled = importlib.util.cache_from_source(source) |
| with open(source, 'w') as f: |
| pass |
| try: |
| os.utime(source, (2 ** 33 - 5, 2 ** 33 - 5)) |
| except OverflowError: |
| self.skipTest("cannot set modification time to large integer") |
| except OSError as e: |
| if e.errno not in (getattr(errno, 'EOVERFLOW', None), |
| getattr(errno, 'EINVAL', None)): |
| raise |
| self.skipTest("cannot set modification time to large integer ({})".format(e)) |
| __import__(TESTFN) |
| # The pyc file was created. |
| os.stat(compiled) |
| finally: |
| del sys.path[0] |
| remove_files(TESTFN) |
| |
| def test_bogus_fromlist(self): |
| try: |
| __import__('http', fromlist=['blah']) |
| except ImportError: |
| self.fail("fromlist must allow bogus names") |
| |
| @cpython_only |
| def test_delete_builtins_import(self): |
| args = ["-c", "del __builtins__.__import__; import os"] |
| popen = script_helper.spawn_python(*args) |
| stdout, stderr = popen.communicate() |
| self.assertIn(b"ImportError", stdout) |
| |
| def test_from_import_message_for_nonexistent_module(self): |
| with self.assertRaisesRegex(ImportError, "^No module named 'bogus'"): |
| from bogus import foo |
| |
| def test_from_import_message_for_existing_module(self): |
| with self.assertRaisesRegex(ImportError, "^cannot import name 'bogus'"): |
| from re import bogus |
| |
| def test_from_import_AttributeError(self): |
| # Issue #24492: trying to import an attribute that raises an |
| # AttributeError should lead to an ImportError. |
| class AlwaysAttributeError: |
| def __getattr__(self, _): |
| raise AttributeError |
| |
| module_name = 'test_from_import_AttributeError' |
| self.addCleanup(unload, module_name) |
| sys.modules[module_name] = AlwaysAttributeError() |
| with self.assertRaises(ImportError) as cm: |
| from test_from_import_AttributeError import does_not_exist |
| |
| self.assertEqual(str(cm.exception), |
| "cannot import name 'does_not_exist' from '<unknown module name>' (unknown location)") |
| |
| @cpython_only |
| def test_issue31492(self): |
| # There shouldn't be an assertion failure in case of failing to import |
| # from a module with a bad __name__ attribute, or in case of failing |
| # to access an attribute of such a module. |
| with swap_attr(os, '__name__', None): |
| with self.assertRaises(ImportError): |
| from os import does_not_exist |
| |
| with self.assertRaises(AttributeError): |
| os.does_not_exist |
| |
| def test_concurrency(self): |
| sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'data')) |
| try: |
| exc = None |
| def run(): |
| event.wait() |
| try: |
| import package |
| except BaseException as e: |
| nonlocal exc |
| exc = e |
| |
| for i in range(10): |
| event = threading.Event() |
| threads = [threading.Thread(target=run) for x in range(2)] |
| try: |
| with test.support.start_threads(threads, event.set): |
| time.sleep(0) |
| finally: |
| sys.modules.pop('package', None) |
| sys.modules.pop('package.submodule', None) |
| if exc is not None: |
| raise exc |
| finally: |
| del sys.path[0] |
| |
| @unittest.skipUnless(sys.platform == "win32", "Windows-specific") |
| def test_dll_dependency_import(self): |
| from _winapi import GetModuleFileName |
| dllname = GetModuleFileName(sys.dllhandle) |
| pydname = importlib.util.find_spec("_sqlite3").origin |
| depname = os.path.join( |
| os.path.dirname(pydname), |
| "sqlite3{}.dll".format("_d" if "_d" in pydname else "")) |
| |
| with test.support.temp_dir() as tmp: |
| tmp2 = os.path.join(tmp, "DLLs") |
| os.mkdir(tmp2) |
| |
| pyexe = os.path.join(tmp, os.path.basename(sys.executable)) |
| shutil.copy(sys.executable, pyexe) |
| shutil.copy(dllname, tmp) |
| for f in glob.glob(os.path.join(glob.escape(sys.prefix), "vcruntime*.dll")): |
| shutil.copy(f, tmp) |
| |
| shutil.copy(pydname, tmp2) |
| |
| env = None |
| env = {k.upper(): os.environ[k] for k in os.environ} |
| env["PYTHONPATH"] = tmp2 + ";" + os.path.dirname(os.__file__) |
| |
| # Test 1: import with added DLL directory |
| subprocess.check_call([ |
| pyexe, "-Sc", ";".join([ |
| "import os", |
| "p = os.add_dll_directory({!r})".format( |
| os.path.dirname(depname)), |
| "import _sqlite3", |
| "p.close" |
| ])], |
| stderr=subprocess.STDOUT, |
| env=env, |
| cwd=os.path.dirname(pyexe)) |
| |
| # Test 2: import with DLL adjacent to PYD |
| shutil.copy(depname, tmp2) |
| subprocess.check_call([pyexe, "-Sc", "import _sqlite3"], |
| stderr=subprocess.STDOUT, |
| env=env, |
| cwd=os.path.dirname(pyexe)) |
| |
| |
| @skip_if_dont_write_bytecode |
| class FilePermissionTests(unittest.TestCase): |
| # tests for file mode on cached .pyc files |
| |
| @unittest.skipUnless(os.name == 'posix', |
| "test meaningful only on posix systems") |
| def test_creation_mode(self): |
| mask = 0o022 |
| with temp_umask(mask), _ready_to_import() as (name, path): |
| cached_path = importlib.util.cache_from_source(path) |
| module = __import__(name) |
| if not os.path.exists(cached_path): |
| self.fail("__import__ did not result in creation of " |
| "a .pyc file") |
| stat_info = os.stat(cached_path) |
| |
| # Check that the umask is respected, and the executable bits |
| # aren't set. |
| self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)), |
| oct(0o666 & ~mask)) |
| |
| @unittest.skipUnless(os.name == 'posix', |
| "test meaningful only on posix systems") |
| def test_cached_mode_issue_2051(self): |
| # permissions of .pyc should match those of .py, regardless of mask |
| mode = 0o600 |
| with temp_umask(0o022), _ready_to_import() as (name, path): |
| cached_path = importlib.util.cache_from_source(path) |
| os.chmod(path, mode) |
| __import__(name) |
| if not os.path.exists(cached_path): |
| self.fail("__import__ did not result in creation of " |
| "a .pyc file") |
| stat_info = os.stat(cached_path) |
| |
| self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)), oct(mode)) |
| |
| @unittest.skipUnless(os.name == 'posix', |
| "test meaningful only on posix systems") |
| def test_cached_readonly(self): |
| mode = 0o400 |
| with temp_umask(0o022), _ready_to_import() as (name, path): |
| cached_path = importlib.util.cache_from_source(path) |
| os.chmod(path, mode) |
| __import__(name) |
| if not os.path.exists(cached_path): |
| self.fail("__import__ did not result in creation of " |
| "a .pyc file") |
| stat_info = os.stat(cached_path) |
| |
| expected = mode | 0o200 # Account for fix for issue #6074 |
| self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)), oct(expected)) |
| |
| def test_pyc_always_writable(self): |
| # Initially read-only .pyc files on Windows used to cause problems |
| # with later updates, see issue #6074 for details |
| with _ready_to_import() as (name, path): |
| # Write a Python file, make it read-only and import it |
| with open(path, 'w') as f: |
| f.write("x = 'original'\n") |
| # Tweak the mtime of the source to ensure pyc gets updated later |
| s = os.stat(path) |
| os.utime(path, (s.st_atime, s.st_mtime-100000000)) |
| os.chmod(path, 0o400) |
| m = __import__(name) |
| self.assertEqual(m.x, 'original') |
| # Change the file and then reimport it |
| os.chmod(path, 0o600) |
| with open(path, 'w') as f: |
| f.write("x = 'rewritten'\n") |
| unload(name) |
| importlib.invalidate_caches() |
| m = __import__(name) |
| self.assertEqual(m.x, 'rewritten') |
| # Now delete the source file and check the pyc was rewritten |
| unlink(path) |
| unload(name) |
| importlib.invalidate_caches() |
| bytecode_only = path + "c" |
| os.rename(importlib.util.cache_from_source(path), bytecode_only) |
| m = __import__(name) |
| self.assertEqual(m.x, 'rewritten') |
| |
| |
| class PycRewritingTests(unittest.TestCase): |
| # Test that the `co_filename` attribute on code objects always points |
| # to the right file, even when various things happen (e.g. both the .py |
| # and the .pyc file are renamed). |
| |
| module_name = "unlikely_module_name" |
| module_source = """ |
| import sys |
| code_filename = sys._getframe().f_code.co_filename |
| module_filename = __file__ |
| constant = 1 |
| def func(): |
| pass |
| func_filename = func.__code__.co_filename |
| """ |
| dir_name = os.path.abspath(TESTFN) |
| file_name = os.path.join(dir_name, module_name) + os.extsep + "py" |
| compiled_name = importlib.util.cache_from_source(file_name) |
| |
| def setUp(self): |
| self.sys_path = sys.path[:] |
| self.orig_module = sys.modules.pop(self.module_name, None) |
| os.mkdir(self.dir_name) |
| with open(self.file_name, "w") as f: |
| f.write(self.module_source) |
| sys.path.insert(0, self.dir_name) |
| importlib.invalidate_caches() |
| |
| def tearDown(self): |
| sys.path[:] = self.sys_path |
| if self.orig_module is not None: |
| sys.modules[self.module_name] = self.orig_module |
| else: |
| unload(self.module_name) |
| unlink(self.file_name) |
| unlink(self.compiled_name) |
| rmtree(self.dir_name) |
| |
| def import_module(self): |
| ns = globals() |
| __import__(self.module_name, ns, ns) |
| return sys.modules[self.module_name] |
| |
| def test_basics(self): |
| mod = self.import_module() |
| self.assertEqual(mod.module_filename, self.file_name) |
| self.assertEqual(mod.code_filename, self.file_name) |
| self.assertEqual(mod.func_filename, self.file_name) |
| del sys.modules[self.module_name] |
| mod = self.import_module() |
| self.assertEqual(mod.module_filename, self.file_name) |
| self.assertEqual(mod.code_filename, self.file_name) |
| self.assertEqual(mod.func_filename, self.file_name) |
| |
| def test_incorrect_code_name(self): |
| py_compile.compile(self.file_name, dfile="another_module.py") |
| mod = self.import_module() |
| self.assertEqual(mod.module_filename, self.file_name) |
| self.assertEqual(mod.code_filename, self.file_name) |
| self.assertEqual(mod.func_filename, self.file_name) |
| |
| def test_module_without_source(self): |
| target = "another_module.py" |
| py_compile.compile(self.file_name, dfile=target) |
| os.remove(self.file_name) |
| pyc_file = make_legacy_pyc(self.file_name) |
| importlib.invalidate_caches() |
| mod = self.import_module() |
| self.assertEqual(mod.module_filename, pyc_file) |
| self.assertEqual(mod.code_filename, target) |
| self.assertEqual(mod.func_filename, target) |
| |
| def test_foreign_code(self): |
| py_compile.compile(self.file_name) |
| with open(self.compiled_name, "rb") as f: |
| header = f.read(16) |
| code = marshal.load(f) |
| constants = list(code.co_consts) |
| foreign_code = importlib.import_module.__code__ |
| pos = constants.index(1) |
| constants[pos] = foreign_code |
| code = code.replace(co_consts=tuple(constants)) |
| with open(self.compiled_name, "wb") as f: |
| f.write(header) |
| marshal.dump(code, f) |
| mod = self.import_module() |
| self.assertEqual(mod.constant.co_filename, foreign_code.co_filename) |
| |
| |
| class PathsTests(unittest.TestCase): |
| SAMPLES = ('test', 'test\u00e4\u00f6\u00fc\u00df', 'test\u00e9\u00e8', |
| 'test\u00b0\u00b3\u00b2') |
| path = TESTFN |
| |
| def setUp(self): |
| os.mkdir(self.path) |
| self.syspath = sys.path[:] |
| |
| def tearDown(self): |
| rmtree(self.path) |
| sys.path[:] = self.syspath |
| |
| # Regression test for http://bugs.python.org/issue1293. |
| def test_trailing_slash(self): |
| with open(os.path.join(self.path, 'test_trailing_slash.py'), 'w') as f: |
| f.write("testdata = 'test_trailing_slash'") |
| sys.path.append(self.path+'/') |
| mod = __import__("test_trailing_slash") |
| self.assertEqual(mod.testdata, 'test_trailing_slash') |
| unload("test_trailing_slash") |
| |
| # Regression test for http://bugs.python.org/issue3677. |
| @unittest.skipUnless(sys.platform == 'win32', 'Windows-specific') |
| def test_UNC_path(self): |
| with open(os.path.join(self.path, 'test_unc_path.py'), 'w') as f: |
| f.write("testdata = 'test_unc_path'") |
| importlib.invalidate_caches() |
| # Create the UNC path, like \\myhost\c$\foo\bar. |
| path = os.path.abspath(self.path) |
| import socket |
| hn = socket.gethostname() |
| drive = path[0] |
| unc = "\\\\%s\\%s$"%(hn, drive) |
| unc += path[2:] |
| try: |
| os.listdir(unc) |
| except OSError as e: |
| if e.errno in (errno.EPERM, errno.EACCES, errno.ENOENT): |
| # See issue #15338 |
| self.skipTest("cannot access administrative share %r" % (unc,)) |
| raise |
| sys.path.insert(0, unc) |
| try: |
| mod = __import__("test_unc_path") |
| except ImportError as e: |
| self.fail("could not import 'test_unc_path' from %r: %r" |
| % (unc, e)) |
| self.assertEqual(mod.testdata, 'test_unc_path') |
| self.assertTrue(mod.__file__.startswith(unc), mod.__file__) |
| unload("test_unc_path") |
| |
| |
| class RelativeImportTests(unittest.TestCase): |
| |
| def tearDown(self): |
| unload("test.relimport") |
| setUp = tearDown |
| |
| def test_relimport_star(self): |
| # This will import * from .test_import. |
| from .. import relimport |
| self.assertTrue(hasattr(relimport, "RelativeImportTests")) |
| |
| def test_issue3221(self): |
| # Note for mergers: the 'absolute' tests from the 2.x branch |
| # are missing in Py3k because implicit relative imports are |
| # a thing of the past |
| # |
| # Regression test for http://bugs.python.org/issue3221. |
| def check_relative(): |
| exec("from . import relimport", ns) |
| |
| # Check relative import OK with __package__ and __name__ correct |
| ns = dict(__package__='test', __name__='test.notarealmodule') |
| check_relative() |
| |
| # Check relative import OK with only __name__ wrong |
| ns = dict(__package__='test', __name__='notarealpkg.notarealmodule') |
| check_relative() |
| |
| # Check relative import fails with only __package__ wrong |
| ns = dict(__package__='foo', __name__='test.notarealmodule') |
| self.assertRaises(ModuleNotFoundError, check_relative) |
| |
| # Check relative import fails with __package__ and __name__ wrong |
| ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule') |
| self.assertRaises(ModuleNotFoundError, check_relative) |
| |
| # Check relative import fails with package set to a non-string |
| ns = dict(__package__=object()) |
| self.assertRaises(TypeError, check_relative) |
| |
| def test_parentless_import_shadowed_by_global(self): |
| # Test as if this were done from the REPL where this error most commonly occurs (bpo-37409). |
| script_helper.assert_python_failure('-W', 'ignore', '-c', |
| "foo = 1; from . import foo") |
| |
| def test_absolute_import_without_future(self): |
| # If explicit relative import syntax is used, then do not try |
| # to perform an absolute import in the face of failure. |
| # Issue #7902. |
| with self.assertRaises(ImportError): |
| from .os import sep |
| self.fail("explicit relative import triggered an " |
| "implicit absolute import") |
| |
| def test_import_from_non_package(self): |
| path = os.path.join(os.path.dirname(__file__), 'data', 'package2') |
| with uncache('submodule1', 'submodule2'), DirsOnSysPath(path): |
| with self.assertRaises(ImportError): |
| import submodule1 |
| self.assertNotIn('submodule1', sys.modules) |
| self.assertNotIn('submodule2', sys.modules) |
| |
| def test_import_from_unloaded_package(self): |
| with uncache('package2', 'package2.submodule1', 'package2.submodule2'), \ |
| DirsOnSysPath(os.path.join(os.path.dirname(__file__), 'data')): |
| import package2.submodule1 |
| package2.submodule1.submodule2 |
| |
| |
| class OverridingImportBuiltinTests(unittest.TestCase): |
| def test_override_builtin(self): |
| # Test that overriding builtins.__import__ can bypass sys.modules. |
| import os |
| |
| def foo(): |
| import os |
| return os |
| self.assertEqual(foo(), os) # Quick sanity check. |
| |
| with swap_attr(builtins, "__import__", lambda *x: 5): |
| self.assertEqual(foo(), 5) |
| |
| # Test what happens when we shadow __import__ in globals(); this |
| # currently does not impact the import process, but if this changes, |
| # other code will need to change, so keep this test as a tripwire. |
| with swap_item(globals(), "__import__", lambda *x: 5): |
| self.assertEqual(foo(), os) |
| |
| |
| class PycacheTests(unittest.TestCase): |
| # Test the various PEP 3147/488-related behaviors. |
| |
| def _clean(self): |
| forget(TESTFN) |
| rmtree('__pycache__') |
| unlink(self.source) |
| |
| def setUp(self): |
| self.source = TESTFN + '.py' |
| self._clean() |
| with open(self.source, 'w') as fp: |
| print('# This is a test file written by test_import.py', file=fp) |
| sys.path.insert(0, os.curdir) |
| importlib.invalidate_caches() |
| |
| def tearDown(self): |
| assert sys.path[0] == os.curdir, 'Unexpected sys.path[0]' |
| del sys.path[0] |
| self._clean() |
| |
| @skip_if_dont_write_bytecode |
| def test_import_pyc_path(self): |
| self.assertFalse(os.path.exists('__pycache__')) |
| __import__(TESTFN) |
| self.assertTrue(os.path.exists('__pycache__')) |
| pyc_path = importlib.util.cache_from_source(self.source) |
| self.assertTrue(os.path.exists(pyc_path), |
| 'bytecode file {!r} for {!r} does not ' |
| 'exist'.format(pyc_path, TESTFN)) |
| |
| @unittest.skipUnless(os.name == 'posix', |
| "test meaningful only on posix systems") |
| @unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0, |
| "due to varying filesystem permission semantics (issue #11956)") |
| @skip_if_dont_write_bytecode |
| def test_unwritable_directory(self): |
| # When the umask causes the new __pycache__ directory to be |
| # unwritable, the import still succeeds but no .pyc file is written. |
| with temp_umask(0o222): |
| __import__(TESTFN) |
| self.assertTrue(os.path.exists('__pycache__')) |
| pyc_path = importlib.util.cache_from_source(self.source) |
| self.assertFalse(os.path.exists(pyc_path), |
| 'bytecode file {!r} for {!r} ' |
| 'exists'.format(pyc_path, TESTFN)) |
| |
| @skip_if_dont_write_bytecode |
| def test_missing_source(self): |
| # With PEP 3147 cache layout, removing the source but leaving the pyc |
| # file does not satisfy the import. |
| __import__(TESTFN) |
| pyc_file = importlib.util.cache_from_source(self.source) |
| self.assertTrue(os.path.exists(pyc_file)) |
| os.remove(self.source) |
| forget(TESTFN) |
| importlib.invalidate_caches() |
| self.assertRaises(ImportError, __import__, TESTFN) |
| |
| @skip_if_dont_write_bytecode |
| def test_missing_source_legacy(self): |
| # Like test_missing_source() except that for backward compatibility, |
| # when the pyc file lives where the py file would have been (and named |
| # without the tag), it is importable. The __file__ of the imported |
| # module is the pyc location. |
| __import__(TESTFN) |
| # pyc_file gets removed in _clean() via tearDown(). |
| pyc_file = make_legacy_pyc(self.source) |
| os.remove(self.source) |
| unload(TESTFN) |
| importlib.invalidate_caches() |
| m = __import__(TESTFN) |
| try: |
| self.assertEqual(m.__file__, |
| os.path.join(os.curdir, os.path.relpath(pyc_file))) |
| finally: |
| os.remove(pyc_file) |
| |
| def test___cached__(self): |
| # Modules now also have an __cached__ that points to the pyc file. |
| m = __import__(TESTFN) |
| pyc_file = importlib.util.cache_from_source(TESTFN + '.py') |
| self.assertEqual(m.__cached__, os.path.join(os.curdir, pyc_file)) |
| |
| @skip_if_dont_write_bytecode |
| def test___cached___legacy_pyc(self): |
| # Like test___cached__() except that for backward compatibility, |
| # when the pyc file lives where the py file would have been (and named |
| # without the tag), it is importable. The __cached__ of the imported |
| # module is the pyc location. |
| __import__(TESTFN) |
| # pyc_file gets removed in _clean() via tearDown(). |
| pyc_file = make_legacy_pyc(self.source) |
| os.remove(self.source) |
| unload(TESTFN) |
| importlib.invalidate_caches() |
| m = __import__(TESTFN) |
| self.assertEqual(m.__cached__, |
| os.path.join(os.curdir, os.path.relpath(pyc_file))) |
| |
| @skip_if_dont_write_bytecode |
| def test_package___cached__(self): |
| # Like test___cached__ but for packages. |
| def cleanup(): |
| rmtree('pep3147') |
| unload('pep3147.foo') |
| unload('pep3147') |
| os.mkdir('pep3147') |
| self.addCleanup(cleanup) |
| # Touch the __init__.py |
| with open(os.path.join('pep3147', '__init__.py'), 'w'): |
| pass |
| with open(os.path.join('pep3147', 'foo.py'), 'w'): |
| pass |
| importlib.invalidate_caches() |
| m = __import__('pep3147.foo') |
| init_pyc = importlib.util.cache_from_source( |
| os.path.join('pep3147', '__init__.py')) |
| self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc)) |
| foo_pyc = importlib.util.cache_from_source(os.path.join('pep3147', 'foo.py')) |
| self.assertEqual(sys.modules['pep3147.foo'].__cached__, |
| os.path.join(os.curdir, foo_pyc)) |
| |
| def test_package___cached___from_pyc(self): |
| # Like test___cached__ but ensuring __cached__ when imported from a |
| # PEP 3147 pyc file. |
| def cleanup(): |
| rmtree('pep3147') |
| unload('pep3147.foo') |
| unload('pep3147') |
| os.mkdir('pep3147') |
| self.addCleanup(cleanup) |
| # Touch the __init__.py |
| with open(os.path.join('pep3147', '__init__.py'), 'w'): |
| pass |
| with open(os.path.join('pep3147', 'foo.py'), 'w'): |
| pass |
| importlib.invalidate_caches() |
| m = __import__('pep3147.foo') |
| unload('pep3147.foo') |
| unload('pep3147') |
| importlib.invalidate_caches() |
| m = __import__('pep3147.foo') |
| init_pyc = importlib.util.cache_from_source( |
| os.path.join('pep3147', '__init__.py')) |
| self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc)) |
| foo_pyc = importlib.util.cache_from_source(os.path.join('pep3147', 'foo.py')) |
| self.assertEqual(sys.modules['pep3147.foo'].__cached__, |
| os.path.join(os.curdir, foo_pyc)) |
| |
| def test_recompute_pyc_same_second(self): |
| # Even when the source file doesn't change timestamp, a change in |
| # source size is enough to trigger recomputation of the pyc file. |
| __import__(TESTFN) |
| unload(TESTFN) |
| with open(self.source, 'a') as fp: |
| print("x = 5", file=fp) |
| m = __import__(TESTFN) |
| self.assertEqual(m.x, 5) |
| |
| |
| class TestSymbolicallyLinkedPackage(unittest.TestCase): |
| package_name = 'sample' |
| tagged = package_name + '-tagged' |
| |
| def setUp(self): |
| test.support.rmtree(self.tagged) |
| test.support.rmtree(self.package_name) |
| self.orig_sys_path = sys.path[:] |
| |
| # create a sample package; imagine you have a package with a tag and |
| # you want to symbolically link it from its untagged name. |
| os.mkdir(self.tagged) |
| self.addCleanup(test.support.rmtree, self.tagged) |
| init_file = os.path.join(self.tagged, '__init__.py') |
| test.support.create_empty_file(init_file) |
| assert os.path.exists(init_file) |
| |
| # now create a symlink to the tagged package |
| # sample -> sample-tagged |
| os.symlink(self.tagged, self.package_name, target_is_directory=True) |
| self.addCleanup(test.support.unlink, self.package_name) |
| importlib.invalidate_caches() |
| |
| self.assertEqual(os.path.isdir(self.package_name), True) |
| |
| assert os.path.isfile(os.path.join(self.package_name, '__init__.py')) |
| |
| def tearDown(self): |
| sys.path[:] = self.orig_sys_path |
| |
| # regression test for issue6727 |
| @unittest.skipUnless( |
| not hasattr(sys, 'getwindowsversion') |
| or sys.getwindowsversion() >= (6, 0), |
| "Windows Vista or later required") |
| @test.support.skip_unless_symlink |
| def test_symlinked_dir_importable(self): |
| # make sure sample can only be imported from the current directory. |
| sys.path[:] = ['.'] |
| assert os.path.exists(self.package_name) |
| assert os.path.exists(os.path.join(self.package_name, '__init__.py')) |
| |
| # Try to import the package |
| importlib.import_module(self.package_name) |
| |
| |
| @cpython_only |
| class ImportlibBootstrapTests(unittest.TestCase): |
| # These tests check that importlib is bootstrapped. |
| |
| def test_frozen_importlib(self): |
| mod = sys.modules['_frozen_importlib'] |
| self.assertTrue(mod) |
| |
| def test_frozen_importlib_is_bootstrap(self): |
| from importlib import _bootstrap |
| mod = sys.modules['_frozen_importlib'] |
| self.assertIs(mod, _bootstrap) |
| self.assertEqual(mod.__name__, 'importlib._bootstrap') |
| self.assertEqual(mod.__package__, 'importlib') |
| self.assertTrue(mod.__file__.endswith('_bootstrap.py'), mod.__file__) |
| |
| def test_frozen_importlib_external_is_bootstrap_external(self): |
| from importlib import _bootstrap_external |
| mod = sys.modules['_frozen_importlib_external'] |
| self.assertIs(mod, _bootstrap_external) |
| self.assertEqual(mod.__name__, 'importlib._bootstrap_external') |
| self.assertEqual(mod.__package__, 'importlib') |
| self.assertTrue(mod.__file__.endswith('_bootstrap_external.py'), mod.__file__) |
| |
| def test_there_can_be_only_one(self): |
| # Issue #15386 revealed a tricky loophole in the bootstrapping |
| # This test is technically redundant, since the bug caused importing |
| # this test module to crash completely, but it helps prove the point |
| from importlib import machinery |
| mod = sys.modules['_frozen_importlib'] |
| self.assertIs(machinery.ModuleSpec, mod.ModuleSpec) |
| |
| |
| @cpython_only |
| class GetSourcefileTests(unittest.TestCase): |
| |
| """Test importlib._bootstrap_external._get_sourcefile() as used by the C API. |
| |
| Because of the peculiarities of the need of this function, the tests are |
| knowingly whitebox tests. |
| |
| """ |
| |
| def test_get_sourcefile(self): |
| # Given a valid bytecode path, return the path to the corresponding |
| # source file if it exists. |
| with mock.patch('importlib._bootstrap_external._path_isfile') as _path_isfile: |
| _path_isfile.return_value = True; |
| path = TESTFN + '.pyc' |
| expect = TESTFN + '.py' |
| self.assertEqual(_get_sourcefile(path), expect) |
| |
| def test_get_sourcefile_no_source(self): |
| # Given a valid bytecode path without a corresponding source path, |
| # return the original bytecode path. |
| with mock.patch('importlib._bootstrap_external._path_isfile') as _path_isfile: |
| _path_isfile.return_value = False; |
| path = TESTFN + '.pyc' |
| self.assertEqual(_get_sourcefile(path), path) |
| |
| def test_get_sourcefile_bad_ext(self): |
| # Given a path with an invalid bytecode extension, return the |
| # bytecode path passed as the argument. |
| path = TESTFN + '.bad_ext' |
| self.assertEqual(_get_sourcefile(path), path) |
| |
| |
| class ImportTracebackTests(unittest.TestCase): |
| |
| def setUp(self): |
| os.mkdir(TESTFN) |
| self.old_path = sys.path[:] |
| sys.path.insert(0, TESTFN) |
| |
| def tearDown(self): |
| sys.path[:] = self.old_path |
| rmtree(TESTFN) |
| |
| def create_module(self, mod, contents, ext=".py"): |
| fname = os.path.join(TESTFN, mod + ext) |
| with open(fname, "w") as f: |
| f.write(contents) |
| self.addCleanup(unload, mod) |
| importlib.invalidate_caches() |
| return fname |
| |
| def assert_traceback(self, tb, files): |
| deduped_files = [] |
| while tb: |
| code = tb.tb_frame.f_code |
| fn = code.co_filename |
| if not deduped_files or fn != deduped_files[-1]: |
| deduped_files.append(fn) |
| tb = tb.tb_next |
| self.assertEqual(len(deduped_files), len(files), deduped_files) |
| for fn, pat in zip(deduped_files, files): |
| self.assertIn(pat, fn) |
| |
| def test_nonexistent_module(self): |
| try: |
| # assertRaises() clears __traceback__ |
| import nonexistent_xyzzy |
| except ImportError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ImportError should have been raised") |
| self.assert_traceback(tb, [__file__]) |
| |
| def test_nonexistent_module_nested(self): |
| self.create_module("foo", "import nonexistent_xyzzy") |
| try: |
| import foo |
| except ImportError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ImportError should have been raised") |
| self.assert_traceback(tb, [__file__, 'foo.py']) |
| |
| def test_exec_failure(self): |
| self.create_module("foo", "1/0") |
| try: |
| import foo |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, 'foo.py']) |
| |
| def test_exec_failure_nested(self): |
| self.create_module("foo", "import bar") |
| self.create_module("bar", "1/0") |
| try: |
| import foo |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, 'foo.py', 'bar.py']) |
| |
| # A few more examples from issue #15425 |
| def test_syntax_error(self): |
| self.create_module("foo", "invalid syntax is invalid") |
| try: |
| import foo |
| except SyntaxError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("SyntaxError should have been raised") |
| self.assert_traceback(tb, [__file__]) |
| |
| def _setup_broken_package(self, parent, child): |
| pkg_name = "_parent_foo" |
| self.addCleanup(unload, pkg_name) |
| pkg_path = os.path.join(TESTFN, pkg_name) |
| os.mkdir(pkg_path) |
| # Touch the __init__.py |
| init_path = os.path.join(pkg_path, '__init__.py') |
| with open(init_path, 'w') as f: |
| f.write(parent) |
| bar_path = os.path.join(pkg_path, 'bar.py') |
| with open(bar_path, 'w') as f: |
| f.write(child) |
| importlib.invalidate_caches() |
| return init_path, bar_path |
| |
| def test_broken_submodule(self): |
| init_path, bar_path = self._setup_broken_package("", "1/0") |
| try: |
| import _parent_foo.bar |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, bar_path]) |
| |
| def test_broken_from(self): |
| init_path, bar_path = self._setup_broken_package("", "1/0") |
| try: |
| from _parent_foo import bar |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ImportError should have been raised") |
| self.assert_traceback(tb, [__file__, bar_path]) |
| |
| def test_broken_parent(self): |
| init_path, bar_path = self._setup_broken_package("1/0", "") |
| try: |
| import _parent_foo.bar |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, init_path]) |
| |
| def test_broken_parent_from(self): |
| init_path, bar_path = self._setup_broken_package("1/0", "") |
| try: |
| from _parent_foo import bar |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, init_path]) |
| |
| @cpython_only |
| def test_import_bug(self): |
| # We simulate a bug in importlib and check that it's not stripped |
| # away from the traceback. |
| self.create_module("foo", "") |
| importlib = sys.modules['_frozen_importlib_external'] |
| if 'load_module' in vars(importlib.SourceLoader): |
| old_exec_module = importlib.SourceLoader.exec_module |
| else: |
| old_exec_module = None |
| try: |
| def exec_module(*args): |
| 1/0 |
| importlib.SourceLoader.exec_module = exec_module |
| try: |
| import foo |
| except ZeroDivisionError as e: |
| tb = e.__traceback__ |
| else: |
| self.fail("ZeroDivisionError should have been raised") |
| self.assert_traceback(tb, [__file__, '<frozen importlib', __file__]) |
| finally: |
| if old_exec_module is None: |
| del importlib.SourceLoader.exec_module |
| else: |
| importlib.SourceLoader.exec_module = old_exec_module |
| |
| @unittest.skipUnless(TESTFN_UNENCODABLE, 'need TESTFN_UNENCODABLE') |
| def test_unencodable_filename(self): |
| # Issue #11619: The Python parser and the import machinery must not |
| # encode filenames, especially on Windows |
| pyname = script_helper.make_script('', TESTFN_UNENCODABLE, 'pass') |
| self.addCleanup(unlink, pyname) |
| name = pyname[:-3] |
| script_helper.assert_python_ok("-c", "mod = __import__(%a)" % name, |
| __isolated=False) |
| |
| |
| class CircularImportTests(unittest.TestCase): |
| |
| """See the docstrings of the modules being imported for the purpose of the |
| test.""" |
| |
| def tearDown(self): |
| """Make sure no modules pre-exist in sys.modules which are being used to |
| test.""" |
| for key in list(sys.modules.keys()): |
| if key.startswith('test.test_import.data.circular_imports'): |
| del sys.modules[key] |
| |
| def test_direct(self): |
| try: |
| import test.test_import.data.circular_imports.basic |
| except ImportError: |
| self.fail('circular import through relative imports failed') |
| |
| def test_indirect(self): |
| try: |
| import test.test_import.data.circular_imports.indirect |
| except ImportError: |
| self.fail('relative import in module contributing to circular ' |
| 'import failed') |
| |
| def test_subpackage(self): |
| try: |
| import test.test_import.data.circular_imports.subpackage |
| except ImportError: |
| self.fail('circular import involving a subpackage failed') |
| |
| def test_rebinding(self): |
| try: |
| import test.test_import.data.circular_imports.rebinding as rebinding |
| except ImportError: |
| self.fail('circular import with rebinding of module attribute failed') |
| from test.test_import.data.circular_imports.subpkg import util |
| self.assertIs(util.util, rebinding.util) |
| |
| def test_binding(self): |
| try: |
| import test.test_import.data.circular_imports.binding |
| except ImportError: |
| self.fail('circular import with binding a submodule to a name failed') |
| |
| def test_crossreference1(self): |
| import test.test_import.data.circular_imports.use |
| import test.test_import.data.circular_imports.source |
| |
| def test_crossreference2(self): |
| with self.assertRaises(AttributeError) as cm: |
| import test.test_import.data.circular_imports.source |
| errmsg = str(cm.exception) |
| self.assertIn('test.test_import.data.circular_imports.source', errmsg) |
| self.assertIn('spam', errmsg) |
| self.assertIn('partially initialized module', errmsg) |
| self.assertIn('circular import', errmsg) |
| |
| def test_circular_from_import(self): |
| with self.assertRaises(ImportError) as cm: |
| import test.test_import.data.circular_imports.from_cycle1 |
| self.assertIn( |
| "cannot import name 'b' from partially initialized module " |
| "'test.test_import.data.circular_imports.from_cycle1' " |
| "(most likely due to a circular import)", |
| str(cm.exception), |
| ) |
| |
| |
| if __name__ == '__main__': |
| # Test needs to be a package, so we can do relative imports. |
| unittest.main() |
