import builtins import imp from importlib.test.import_ import test_relative_imports from importlib.test.import_ import util as importlib_util import marshal import os import py_compile import random import stat import sys import unittest import textwrap 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) from test import script_helper def remove_files(name): for f in (name + ".py", name + ".pyc", name + ".pyo", name + ".pyw", name + "$py.class"): unlink(f) rmtree('__pycache__') class ImportTests(unittest.TestCase): def setUp(self): remove_files(TESTFN) def tearDown(self): unload(TESTFN) setUp = tearDown def test_case_sensitivity(self): # Brief digression to test that import is case-sensitive: if we got # this far, we know for sure that "random" exists. with self.assertRaises(ImportError): import RAnDoM def test_double_const(self): # Another brief digression to test the accuracy of manifest float # constants. from test import double_const # don't blink -- that *was* the test def test_import(self): def test_with_extension(ext): # The extension is normally ".py", perhaps ".pyw". source = TESTFN + ext pyo = TESTFN + ".pyo" if is_jython: pyc = TESTFN + "$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] 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] @unittest.skipUnless(os.name == 'posix', "test meaningful only on posix systems") def test_execute_bit_not_copied(self): # Issue 6070: under posix .pyc files got their execute bit set if # the .py file had the execute bit set, but they aren't executable. with temp_umask(0o022): sys.path.insert(0, os.curdir) try: fname = TESTFN + os.extsep + "py" open(fname, 'w').close() os.chmod(fname, (stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)) __import__(TESTFN) fn = imp.cache_from_source(fname) if not os.path.exists(fn): self.fail("__import__ did not result in creation of " "either a .pyc or .pyo file") s = os.stat(fn) self.assertEqual( stat.S_IMODE(s.st_mode), stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH) finally: del sys.path[0] remove_files(TESTFN) unload(TESTFN) def test_imp_module(self): # Verify that the imp module can correctly load and find .py files # XXX (ncoghlan): It would be nice to use support.CleanImport # here, but that breaks because the os module registers some # handlers in copy_reg on import. Since CleanImport doesn't # revert that registration, the module is left in a broken # state after reversion. Reinitialising the module contents # and just reverting os.environ to its previous state is an OK # workaround orig_path = os.path orig_getenv = os.getenv with EnvironmentVarGuard(): x = imp.find_module("os") self.addCleanup(x[0].close) new_os = imp.load_module("os", *x) self.assertIs(os, new_os) self.assertIs(orig_path, new_os.path) self.assertIsNot(orig_getenv, new_os.getenv) 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('') 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) 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) 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) 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_initless_directory_warning(self): with check_warnings(('', ImportWarning)): # Just a random non-package directory we always expect to be # somewhere in sys.path... self.assertRaises(ImportError, __import__, "site-packages") 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) self.assertEqual("Import by filename is not supported.", c.exception.args[0]) 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) 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) 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) 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(8) 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. def _test_UNC_path(self): with open(os.path.join(self.path, 'test_trailing_slash.py'), 'w') as f: f.write("testdata = 'test_trailing_slash'") # 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:] sys.path.append(path) mod = __import__("test_trailing_slash") self.assertEqual(mod.testdata, 'test_trailing_slash') unload("test_trailing_slash") if sys.platform == "win32": test_UNC_path = _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(ValueError, 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) def tearDown(self): assert sys.path[0] == os.curdir, 'Unexpected sys.path[0]' del sys.path[0] self._clean() 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, __debug__ and 'c' or 'o')))) @unittest.skipUnless(os.name == 'posix', "test meaningful only on posix systems") 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)))) 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) 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) 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)) 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) m = __import__(TESTFN) self.assertEqual(m.__cached__, os.path.join(os.curdir, os.path.relpath(pyc_file))) def test_package___cached__(self): # Like test___cached__ but for packages. def cleanup(): rmtree('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 unload('pep3147.foo') unload('pep3147') 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') os.mkdir('pep3147') self.addCleanup(cleanup) unload('pep3147.foo') unload('pep3147') # Touch the __init__.py with open(os.path.join('pep3147', '__init__.py'), 'w'): pass with open(os.path.join('pep3147', 'foo.py'), 'w'): pass m = __import__('pep3147.foo') unload('pep3147.foo') unload('pep3147') 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)) class RelativeImportFromImportlibTests(test_relative_imports.RelativeImports): def setUp(self): self._importlib_util_flag = importlib_util.using___import__ importlib_util.using___import__ = True def tearDown(self): importlib_util.using___import__ = self._importlib_util_flag def test_main(verbose=None): run_unittest(ImportTests, PycacheTests, PycRewritingTests, PathsTests, RelativeImportTests, OverridingImportBuiltinTests, RelativeImportFromImportlibTests) if __name__ == '__main__': # Test needs to be a package, so we can do relative imports. from test.test_import import test_main test_main()