mirror of https://github.com/python/cpython
461 lines
18 KiB
Python
461 lines
18 KiB
Python
import importlib
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import importlib.util
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import os
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import os.path
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import py_compile
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import sys
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from test import support
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from test.support import import_helper
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from test.support import os_helper
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from test.support import script_helper
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import unittest
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import warnings
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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import imp
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import _imp
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def requires_load_dynamic(meth):
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"""Decorator to skip a test if not running under CPython or lacking
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imp.load_dynamic()."""
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meth = support.cpython_only(meth)
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return unittest.skipIf(not hasattr(imp, 'load_dynamic'),
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'imp.load_dynamic() required')(meth)
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class LockTests(unittest.TestCase):
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"""Very basic test of import lock functions."""
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def verify_lock_state(self, expected):
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self.assertEqual(imp.lock_held(), expected,
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"expected imp.lock_held() to be %r" % expected)
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def testLock(self):
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LOOPS = 50
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# The import lock may already be held, e.g. if the test suite is run
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# via "import test.autotest".
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lock_held_at_start = imp.lock_held()
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self.verify_lock_state(lock_held_at_start)
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for i in range(LOOPS):
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imp.acquire_lock()
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self.verify_lock_state(True)
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for i in range(LOOPS):
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imp.release_lock()
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# The original state should be restored now.
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self.verify_lock_state(lock_held_at_start)
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if not lock_held_at_start:
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try:
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imp.release_lock()
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except RuntimeError:
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pass
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else:
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self.fail("release_lock() without lock should raise "
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"RuntimeError")
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class ImportTests(unittest.TestCase):
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def setUp(self):
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mod = importlib.import_module('test.encoded_modules')
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self.test_strings = mod.test_strings
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self.test_path = mod.__path__
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def test_import_encoded_module(self):
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for modname, encoding, teststr in self.test_strings:
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mod = importlib.import_module('test.encoded_modules.'
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'module_' + modname)
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self.assertEqual(teststr, mod.test)
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def test_find_module_encoding(self):
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for mod, encoding, _ in self.test_strings:
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with imp.find_module('module_' + mod, self.test_path)[0] as fd:
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self.assertEqual(fd.encoding, encoding)
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path = [os.path.dirname(__file__)]
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with self.assertRaises(SyntaxError):
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imp.find_module('badsyntax_pep3120', path)
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def test_issue1267(self):
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for mod, encoding, _ in self.test_strings:
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fp, filename, info = imp.find_module('module_' + mod,
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self.test_path)
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with fp:
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self.assertNotEqual(fp, None)
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self.assertEqual(fp.encoding, encoding)
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self.assertEqual(fp.tell(), 0)
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self.assertEqual(fp.readline(), '# test %s encoding\n'
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% encoding)
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fp, filename, info = imp.find_module("tokenize")
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with fp:
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self.assertNotEqual(fp, None)
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self.assertEqual(fp.encoding, "utf-8")
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self.assertEqual(fp.tell(), 0)
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self.assertEqual(fp.readline(),
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'"""Tokenization help for Python programs.\n')
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def test_issue3594(self):
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temp_mod_name = 'test_imp_helper'
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sys.path.insert(0, '.')
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try:
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with open(temp_mod_name + '.py', 'w', encoding="latin-1") as file:
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file.write("# coding: cp1252\nu = 'test.test_imp'\n")
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file, filename, info = imp.find_module(temp_mod_name)
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file.close()
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self.assertEqual(file.encoding, 'cp1252')
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finally:
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del sys.path[0]
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os_helper.unlink(temp_mod_name + '.py')
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os_helper.unlink(temp_mod_name + '.pyc')
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def test_issue5604(self):
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# Test cannot cover imp.load_compiled function.
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# Martin von Loewis note what shared library cannot have non-ascii
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# character because init_xxx function cannot be compiled
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# and issue never happens for dynamic modules.
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# But sources modified to follow generic way for processing paths.
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# the return encoding could be uppercase or None
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fs_encoding = sys.getfilesystemencoding()
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# covers utf-8 and Windows ANSI code pages
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# one non-space symbol from every page
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# (http://en.wikipedia.org/wiki/Code_page)
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known_locales = {
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'utf-8' : b'\xc3\xa4',
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'cp1250' : b'\x8C',
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'cp1251' : b'\xc0',
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'cp1252' : b'\xc0',
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'cp1253' : b'\xc1',
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'cp1254' : b'\xc0',
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'cp1255' : b'\xe0',
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'cp1256' : b'\xe0',
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'cp1257' : b'\xc0',
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'cp1258' : b'\xc0',
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}
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if sys.platform == 'darwin':
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self.assertEqual(fs_encoding, 'utf-8')
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# Mac OS X uses the Normal Form D decomposition
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# http://developer.apple.com/mac/library/qa/qa2001/qa1173.html
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special_char = b'a\xcc\x88'
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else:
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special_char = known_locales.get(fs_encoding)
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if not special_char:
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self.skipTest("can't run this test with %s as filesystem encoding"
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% fs_encoding)
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decoded_char = special_char.decode(fs_encoding)
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temp_mod_name = 'test_imp_helper_' + decoded_char
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test_package_name = 'test_imp_helper_package_' + decoded_char
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init_file_name = os.path.join(test_package_name, '__init__.py')
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try:
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# if the curdir is not in sys.path the test fails when run with
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# ./python ./Lib/test/regrtest.py test_imp
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sys.path.insert(0, os.curdir)
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with open(temp_mod_name + '.py', 'w', encoding="utf-8") as file:
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file.write('a = 1\n')
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file, filename, info = imp.find_module(temp_mod_name)
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with file:
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self.assertIsNotNone(file)
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self.assertTrue(filename[:-3].endswith(temp_mod_name))
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self.assertEqual(info[0], '.py')
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self.assertEqual(info[1], 'r')
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self.assertEqual(info[2], imp.PY_SOURCE)
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mod = imp.load_module(temp_mod_name, file, filename, info)
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self.assertEqual(mod.a, 1)
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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mod = imp.load_source(temp_mod_name, temp_mod_name + '.py')
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self.assertEqual(mod.a, 1)
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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if not sys.dont_write_bytecode:
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mod = imp.load_compiled(
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temp_mod_name,
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imp.cache_from_source(temp_mod_name + '.py'))
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self.assertEqual(mod.a, 1)
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if not os.path.exists(test_package_name):
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os.mkdir(test_package_name)
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with open(init_file_name, 'w', encoding="utf-8") as file:
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file.write('b = 2\n')
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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package = imp.load_package(test_package_name, test_package_name)
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self.assertEqual(package.b, 2)
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finally:
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del sys.path[0]
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for ext in ('.py', '.pyc'):
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os_helper.unlink(temp_mod_name + ext)
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os_helper.unlink(init_file_name + ext)
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os_helper.rmtree(test_package_name)
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os_helper.rmtree('__pycache__')
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def test_issue9319(self):
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path = os.path.dirname(__file__)
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self.assertRaises(SyntaxError,
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imp.find_module, "badsyntax_pep3120", [path])
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def test_load_from_source(self):
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# Verify that the imp module can correctly load and find .py files
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# XXX (ncoghlan): It would be nice to use import_helper.CleanImport
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# here, but that breaks because the os module registers some
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# handlers in copy_reg on import. Since CleanImport doesn't
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# revert that registration, the module is left in a broken
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# state after reversion. Reinitialising the module contents
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# and just reverting os.environ to its previous state is an OK
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# workaround
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orig_path = os.path
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orig_getenv = os.getenv
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with os_helper.EnvironmentVarGuard():
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x = imp.find_module("os")
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self.addCleanup(x[0].close)
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new_os = imp.load_module("os", *x)
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self.assertIs(os, new_os)
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self.assertIs(orig_path, new_os.path)
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self.assertIsNot(orig_getenv, new_os.getenv)
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@requires_load_dynamic
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def test_issue15828_load_extensions(self):
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# Issue 15828 picked up that the adapter between the old imp API
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# and importlib couldn't handle C extensions
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example = "_heapq"
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x = imp.find_module(example)
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file_ = x[0]
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if file_ is not None:
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self.addCleanup(file_.close)
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mod = imp.load_module(example, *x)
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self.assertEqual(mod.__name__, example)
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@requires_load_dynamic
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def test_issue16421_multiple_modules_in_one_dll(self):
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# Issue 16421: loading several modules from the same compiled file fails
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m = '_testimportmultiple'
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fileobj, pathname, description = imp.find_module(m)
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fileobj.close()
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mod0 = imp.load_dynamic(m, pathname)
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mod1 = imp.load_dynamic('_testimportmultiple_foo', pathname)
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mod2 = imp.load_dynamic('_testimportmultiple_bar', pathname)
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self.assertEqual(mod0.__name__, m)
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self.assertEqual(mod1.__name__, '_testimportmultiple_foo')
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self.assertEqual(mod2.__name__, '_testimportmultiple_bar')
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with self.assertRaises(ImportError):
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imp.load_dynamic('nonexistent', pathname)
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@requires_load_dynamic
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def test_load_dynamic_ImportError_path(self):
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# Issue #1559549 added `name` and `path` attributes to ImportError
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# in order to provide better detail. Issue #10854 implemented those
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# attributes on import failures of extensions on Windows.
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path = 'bogus file path'
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name = 'extension'
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with self.assertRaises(ImportError) as err:
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imp.load_dynamic(name, path)
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self.assertIn(path, err.exception.path)
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self.assertEqual(name, err.exception.name)
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@requires_load_dynamic
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def test_load_module_extension_file_is_None(self):
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# When loading an extension module and the file is None, open one
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# on the behalf of imp.load_dynamic().
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# Issue #15902
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name = '_testimportmultiple'
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found = imp.find_module(name)
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if found[0] is not None:
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found[0].close()
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if found[2][2] != imp.C_EXTENSION:
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self.skipTest("found module doesn't appear to be a C extension")
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imp.load_module(name, None, *found[1:])
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@requires_load_dynamic
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def test_issue24748_load_module_skips_sys_modules_check(self):
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name = 'test.imp_dummy'
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try:
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del sys.modules[name]
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except KeyError:
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pass
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try:
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module = importlib.import_module(name)
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spec = importlib.util.find_spec('_testmultiphase')
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module = imp.load_dynamic(name, spec.origin)
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self.assertEqual(module.__name__, name)
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self.assertEqual(module.__spec__.name, name)
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self.assertEqual(module.__spec__.origin, spec.origin)
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self.assertRaises(AttributeError, getattr, module, 'dummy_name')
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self.assertEqual(module.int_const, 1969)
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self.assertIs(sys.modules[name], module)
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finally:
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try:
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del sys.modules[name]
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except KeyError:
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pass
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@unittest.skipIf(sys.dont_write_bytecode,
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"test meaningful only when writing bytecode")
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def test_bug7732(self):
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with os_helper.temp_cwd():
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source = os_helper.TESTFN + '.py'
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os.mkdir(source)
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self.assertRaisesRegex(ImportError, '^No module',
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imp.find_module, os_helper.TESTFN, ["."])
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def test_multiple_calls_to_get_data(self):
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# Issue #18755: make sure multiple calls to get_data() can succeed.
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loader = imp._LoadSourceCompatibility('imp', imp.__file__,
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open(imp.__file__, encoding="utf-8"))
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loader.get_data(imp.__file__) # File should be closed
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loader.get_data(imp.__file__) # Will need to create a newly opened file
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def test_load_source(self):
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# Create a temporary module since load_source(name) modifies
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# sys.modules[name] attributes like __loader___
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modname = f"tmp{__name__}"
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mod = type(sys.modules[__name__])(modname)
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with support.swap_item(sys.modules, modname, mod):
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with self.assertRaisesRegex(ValueError, 'embedded null'):
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imp.load_source(modname, __file__ + "\0")
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@support.cpython_only
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def test_issue31315(self):
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# There shouldn't be an assertion failure in imp.create_dynamic(),
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# when spec.name is not a string.
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create_dynamic = support.get_attribute(imp, 'create_dynamic')
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class BadSpec:
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name = None
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origin = 'foo'
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with self.assertRaises(TypeError):
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create_dynamic(BadSpec())
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def test_issue_35321(self):
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# Both _frozen_importlib and _frozen_importlib_external
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# should have a spec origin of "frozen" and
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# no need to clean up imports in this case.
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import _frozen_importlib_external
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self.assertEqual(_frozen_importlib_external.__spec__.origin, "frozen")
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import _frozen_importlib
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self.assertEqual(_frozen_importlib.__spec__.origin, "frozen")
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def test_source_hash(self):
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self.assertEqual(_imp.source_hash(42, b'hi'), b'\xc6\xe7Z\r\x03:}\xab')
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self.assertEqual(_imp.source_hash(43, b'hi'), b'\x85\x9765\xf8\x9a\x8b9')
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def test_pyc_invalidation_mode_from_cmdline(self):
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cases = [
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([], "default"),
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(["--check-hash-based-pycs", "default"], "default"),
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(["--check-hash-based-pycs", "always"], "always"),
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(["--check-hash-based-pycs", "never"], "never"),
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]
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for interp_args, expected in cases:
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args = interp_args + [
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"-c",
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"import _imp; print(_imp.check_hash_based_pycs)",
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]
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res = script_helper.assert_python_ok(*args)
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self.assertEqual(res.out.strip().decode('utf-8'), expected)
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def test_find_and_load_checked_pyc(self):
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# issue 34056
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with os_helper.temp_cwd():
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with open('mymod.py', 'wb') as fp:
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fp.write(b'x = 42\n')
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py_compile.compile(
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'mymod.py',
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doraise=True,
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invalidation_mode=py_compile.PycInvalidationMode.CHECKED_HASH,
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)
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file, path, description = imp.find_module('mymod', path=['.'])
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mod = imp.load_module('mymod', file, path, description)
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self.assertEqual(mod.x, 42)
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class ReloadTests(unittest.TestCase):
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"""Very basic tests to make sure that imp.reload() operates just like
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reload()."""
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def test_source(self):
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# XXX (ncoghlan): It would be nice to use test.import_helper.CleanImport
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# here, but that breaks because the os module registers some
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# handlers in copy_reg on import. Since CleanImport doesn't
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# revert that registration, the module is left in a broken
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# state after reversion. Reinitialising the module contents
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# and just reverting os.environ to its previous state is an OK
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# workaround
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with os_helper.EnvironmentVarGuard():
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import os
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imp.reload(os)
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def test_extension(self):
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with import_helper.CleanImport('time'):
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import time
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imp.reload(time)
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def test_builtin(self):
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with import_helper.CleanImport('marshal'):
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import marshal
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imp.reload(marshal)
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def test_with_deleted_parent(self):
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# see #18681
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from html import parser
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html = sys.modules.pop('html')
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def cleanup():
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sys.modules['html'] = html
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self.addCleanup(cleanup)
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with self.assertRaisesRegex(ImportError, 'html'):
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imp.reload(parser)
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class PEP3147Tests(unittest.TestCase):
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"""Tests of PEP 3147."""
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tag = imp.get_tag()
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@unittest.skipUnless(sys.implementation.cache_tag is not None,
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'requires sys.implementation.cache_tag not be None')
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def test_cache_from_source(self):
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# Given the path to a .py file, return the path to its PEP 3147
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# defined .pyc file (i.e. under __pycache__).
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path = os.path.join('foo', 'bar', 'baz', 'qux.py')
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expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
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'qux.{}.pyc'.format(self.tag))
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self.assertEqual(imp.cache_from_source(path, True), expect)
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@unittest.skipUnless(sys.implementation.cache_tag is not None,
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'requires sys.implementation.cache_tag to not be '
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'None')
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def test_source_from_cache(self):
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# Given the path to a PEP 3147 defined .pyc file, return the path to
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# its source. This tests the good path.
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path = os.path.join('foo', 'bar', 'baz', '__pycache__',
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'qux.{}.pyc'.format(self.tag))
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expect = os.path.join('foo', 'bar', 'baz', 'qux.py')
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self.assertEqual(imp.source_from_cache(path), expect)
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class NullImporterTests(unittest.TestCase):
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@unittest.skipIf(os_helper.TESTFN_UNENCODABLE is None,
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"Need an undecodeable filename")
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def test_unencodeable(self):
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name = os_helper.TESTFN_UNENCODABLE
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os.mkdir(name)
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try:
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self.assertRaises(ImportError, imp.NullImporter, name)
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finally:
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os.rmdir(name)
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if __name__ == "__main__":
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unittest.main()
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