# We import importlib *ASAP* in order to test #15386 import importlib import builtins import imp from test.test_importlib.import_ import util as importlib_util import marshal import os import platform import py_compile import random import stat import sys import unittest import textwrap import errno import shutil import contextlib import test.support from test.support import ( EnvironmentVarGuard, TESTFN, check_warnings, forget, is_jython, make_legacy_pyc, rmtree, run_unittest, swap_attr, swap_item, temp_umask, unlink, unload, create_empty_file, cpython_only) from test import script_helper 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 + ".pyo", name + ".pyw", name + "$py.class"): unlink(f) rmtree('__pycache__') @contextlib.contextmanager def _ready_to_import(name=None, source=""): # sets up a temporary directory and removes it # creates the module file # temporarily clears the module from sys.modules (if any) # reverts or removes the module when cleaning up name = name or "spam" with script_helper.temp_dir() as tempdir: path = script_helper.make_script(tempdir, name, source) old_module = sys.modules.pop(name, None) try: sys.path.insert(0, tempdir) yield name, path sys.path.remove(tempdir) finally: if old_module is not None: sys.modules[name] = old_module elif name in sys.modules: del sys.modules[name] class ImportTests(unittest.TestCase): def setUp(self): remove_files(TESTFN) importlib.invalidate_caches() def tearDown(self): unload(TESTFN) setUp = tearDown def test_case_sensitivity(self): # Brief digression to test that import is case-sensitive: if we got # this far, we know for sure that "random" exists. with self.assertRaises(ImportError): import RAnDoM def test_double_const(self): # Another brief digression to test the accuracy of manifest float # constants. from test import double_const # don't blink -- that *was* the test def test_import(self): def test_with_extension(ext): # The extension is normally ".py", perhaps ".pyw". source = TESTFN + ext pyo = TESTFN + ".pyo" if is_jython: pyc = TESTFN + "$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) unlink(pyo) 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] @skip_if_dont_write_bytecode def test_bug7732(self): source = TESTFN + '.py' os.mkdir(source) try: self.assertRaisesRegex(ImportError, '^No module', imp.find_module, TESTFN, ["."]) finally: os.rmdir(source) 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 (or .pyo). # 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() try: make_legacy_pyc(filename) # This used to crash. exec('import ' + module) finally: # Cleanup. del sys.path[-1] unlink(filename + 'c') unlink(filename + 'o') 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.assertTrue(x is 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.assertTrue(y is test.support, y.__name__) 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, imp.reload, mod) # But we still expect the module to be in sys.modules. mod = sys.modules.get(TESTFN) self.assertIsNot(mod, None, "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.assertIn(ext, ('.pyc', '.pyo')) finally: del sys.path[0] remove_files(TESTFN) if TESTFN in sys.modules: del sys.modules[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_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 imp sys.argv.insert(0, C()) """)) script_helper.assert_python_ok(testfn) 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 = imp.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 != getattr(errno, 'EOVERFLOW', 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") @skip_if_dont_write_bytecode class FilePermissionTests(unittest.TestCase): # tests for file mode on cached .pyc/.pyo 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 = imp.cache_from_source(path) module = __import__(name) if not os.path.exists(cached_path): self.fail("__import__ did not result in creation of " "either a .pyc or .pyo 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 = imp.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 " "either a .pyc or .pyo 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 = imp.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 " "either a .pyc or .pyo 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() if __debug__: bytecode_only = path + "c" else: bytecode_only = path + "o" os.rename(imp.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 = imp.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(12) code = marshal.load(f) constants = list(code.co_consts) foreign_code = test_main.__code__ pos = constants.index(1) constants[pos] = foreign_code code = type(code)(code.co_argcount, code.co_kwonlyargcount, code.co_nlocals, code.co_stacksize, code.co_flags, code.co_code, tuple(constants), code.co_names, code.co_varnames, code.co_filename, code.co_name, code.co_firstlineno, code.co_lnotab, code.co_freevars, code.co_cellvars) 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): # 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(SystemError, check_relative) # Check relative import fails with __package__ and __name__ wrong ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule') self.assertRaises(SystemError, check_relative) # Check relative import fails with package set to a non-string ns = dict(__package__=object()) self.assertRaises(TypeError, check_relative) 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") 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 related behaviors. tag = imp.get_tag() 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__')) self.assertTrue(os.path.exists(os.path.join( '__pycache__', '{}.{}.py{}'.format( TESTFN, self.tag, 'c' if __debug__ else 'o')))) @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__')) self.assertFalse(os.path.exists(os.path.join( '__pycache__', '{}.{}.pyc'.format(TESTFN, self.tag)))) @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 = imp.cache_from_source(self.source) self.assertTrue(os.path.exists(pyc_file)) os.remove(self.source) forget(TESTFN) 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) self.assertEqual(m.__file__, os.path.join(os.curdir, os.path.relpath(pyc_file))) def test___cached__(self): # Modules now also have an __cached__ that points to the pyc file. m = __import__(TESTFN) pyc_file = imp.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 = imp.cache_from_source( os.path.join('pep3147', '__init__.py')) self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc)) foo_pyc = imp.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 = imp.cache_from_source( os.path.join('pep3147', '__init__.py')) self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc)) foo_pyc = imp.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_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.FileFinder, mod.FileFinder) self.assertIs(imp.new_module, mod.new_module) 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'] old_load_module = importlib.SourceLoader.load_module try: def load_module(*args): 1/0 importlib.SourceLoader.load_module = load_module try: import foo except ZeroDivisionError as e: tb = e.__traceback__ else: self.fail("ZeroDivisionError should have been raised") self.assert_traceback(tb, [__file__, '