try:
import _thread
except ImportError:
_thread = None
import importlib
import os
import os.path
import shutil
import sys
from test import support
import unittest
import warnings
with warnings.catch_warnings():
warnings.simplefilter('ignore', PendingDeprecationWarning)
import imp
def requires_load_dynamic(meth):
"""Decorator to skip a test if not running under CPython or lacking
imp.load_dynamic()."""
meth = support.cpython_only(meth)
return unittest.skipIf(not hasattr(imp, 'load_dynamic'),
'imp.load_dynamic() required')(meth)
@unittest.skipIf(_thread is None, '_thread module is required')
class LockTests(unittest.TestCase):
"""Very basic test of import lock functions."""
def verify_lock_state(self, expected):
self.assertEqual(imp.lock_held(), expected,
"expected imp.lock_held() to be %r" % expected)
def testLock(self):
LOOPS = 50
# The import lock may already be held, e.g. if the test suite is run
# via "import test.autotest".
lock_held_at_start = imp.lock_held()
self.verify_lock_state(lock_held_at_start)
for i in range(LOOPS):
imp.acquire_lock()
self.verify_lock_state(True)
for i in range(LOOPS):
imp.release_lock()
# The original state should be restored now.
self.verify_lock_state(lock_held_at_start)
if not lock_held_at_start:
try:
imp.release_lock()
except RuntimeError:
pass
else:
self.fail("release_lock() without lock should raise "
"RuntimeError")
class ImportTests(unittest.TestCase):
def setUp(self):
mod = importlib.import_module('test.encoded_modules')
self.test_strings = mod.test_strings
self.test_path = mod.__path__
def test_import_encoded_module(self):
for modname, encoding, teststr in self.test_strings:
mod = importlib.import_module('test.encoded_modules.'
'module_' + modname)
self.assertEqual(teststr, mod.test)
def test_find_module_encoding(self):
for mod, encoding, _ in self.test_strings:
with imp.find_module('module_' + mod, self.test_path)[0] as fd:
self.assertEqual(fd.encoding, encoding)
path = [os.path.dirname(__file__)]
with self.assertRaises(SyntaxError):
imp.find_module('badsyntax_pep3120', path)
def test_issue1267(self):
for mod, encoding, _ in self.test_strings:
fp, filename, info = imp.find_module('module_' + mod,
self.test_path)
with fp:
self.assertNotEqual(fp, None)
self.assertEqual(fp.encoding, encoding)
self.assertEqual(fp.tell(), 0)
self.assertEqual(fp.readline(), '# test %s encoding\n'
% encoding)
fp, filename, info = imp.find_module("tokenize")
with fp:
self.assertNotEqual(fp, None)
self.assertEqual(fp.encoding, "utf-8")
self.assertEqual(fp.tell(), 0)
self.assertEqual(fp.readline(),
'"""Tokenization help for Python programs.\n')
def test_issue3594(self):
temp_mod_name = 'test_imp_helper'
sys.path.insert(0, '.')
try:
with open(temp_mod_name + '.py', 'w') as file:
file.write("# coding: cp1252\nu = 'test.test_imp'\n")
file, filename, info = imp.find_module(temp_mod_name)
file.close()
self.assertEqual(file.encoding, 'cp1252')
finally:
del sys.path[0]
support.unlink(temp_mod_name + '.py')
support.unlink(temp_mod_name + '.pyc')
support.unlink(temp_mod_name + '.pyo')
def test_issue5604(self):
# Test cannot cover imp.load_compiled function.
# Martin von Loewis note what shared library cannot have non-ascii
# character because init_xxx function cannot be compiled
# and issue never happens for dynamic modules.
# But sources modified to follow generic way for processing pathes.
# the return encoding could be uppercase or None
fs_encoding = sys.getfilesystemencoding()
# covers utf-8 and Windows ANSI code pages
# one non-space symbol from every page
# (http://en.wikipedia.org/wiki/Code_page)
known_locales = {
'utf-8' : b'\xc3\xa4',
'cp1250' : b'\x8C',
'cp1251' : b'\xc0',
'cp1252' : b'\xc0',
'cp1253' : b'\xc1',
'cp1254' : b'\xc0',
'cp1255' : b'\xe0',
'cp1256' : b'\xe0',
'cp1257' : b'\xc0',
'cp1258' : b'\xc0',
}
if sys.platform == 'darwin':
self.assertEqual(fs_encoding, 'utf-8')
# Mac OS X uses the Normal Form D decomposition
# http://developer.apple.com/mac/library/qa/qa2001/qa1173.html
special_char = b'a\xcc\x88'
else:
special_char = known_locales.get(fs_encoding)
if not special_char:
self.skipTest("can't run this test with %s as filesystem encoding"
% fs_encoding)
decoded_char = special_char.decode(fs_encoding)
temp_mod_name = 'test_imp_helper_' + decoded_char
test_package_name = 'test_imp_helper_package_' + decoded_char
init_file_name = os.path.join(test_package_name, '__init__.py')
try:
# if the curdir is not in sys.path the test fails when run with
# ./python ./Lib/test/regrtest.py test_imp
sys.path.insert(0, os.curdir)
with open(temp_mod_name + '.py', 'w') as file:
file.write('a = 1\n')
file, filename, info = imp.find_module(temp_mod_name)
with file:
self.assertIsNotNone(file)
self.assertTrue(filename[:-3].endswith(temp_mod_name))
self.assertEqual(info[0], '.py')
self.assertEqual(info[1], 'r')
self.assertEqual(info[2], imp.PY_SOURCE)
mod = imp.load_module(temp_mod_name, file, filename, info)
self.assertEqual(mod.a, 1)
with warnings.catch_warnings():
warnings.simplefilter('ignore')
mod = imp.load_source(temp_mod_name, temp_mod_name + '.py')
self.assertEqual(mod.a, 1)
with warnings.catch_warnings():
warnings.simplefilter('ignore')
if not sys.dont_write_bytecode:
mod = imp.load_compiled(
temp_mod_name,
imp.cache_from_source(temp_mod_name + '.py'))
self.assertEqual(mod.a, 1)
if not os.path.exists(test_package_name):
os.mkdir(test_package_name)
with open(init_file_name, 'w') as file:
file.write('b = 2\n')
with warnings.catch_warnings():
warnings.simplefilter('ignore')
package = imp.load_package(test_package_name, test_package_name)
self.assertEqual(package.b, 2)
finally:
del sys.path[0]
for ext in ('.py', '.pyc', '.pyo'):
support.unlink(temp_mod_name + ext)
support.unlink(init_file_name + ext)
support.rmtree(test_package_name)
support.rmtree('__pycache__')
def test_issue9319(self):
path = os.path.dirname(__file__)
self.assertRaises(SyntaxError,
imp.find_module, "badsyntax_pep3120", [path])
def test_load_from_source(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 support.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)
@requires_load_dynamic
def test_issue15828_load_extensions(self):
# Issue 15828 picked up that the adapter between the old imp API
# and importlib couldn't handle C extensions
example = "_heapq"
x = imp.find_module(example)
file_ = x[0]
if file_ is not None:
self.addCleanup(file_.close)
mod = imp.load_module(example, *x)
self.assertEqual(mod.__name__, example)
@requires_load_dynamic
def test_issue16421_multiple_modules_in_one_dll(self):
# Issue 16421: loading several modules from the same compiled file fails
m = '_testimportmultiple'
fileobj, pathname, description = imp.find_module(m)
fileobj.close()
mod0 = imp.load_dynamic(m, pathname)
mod1 = imp.load_dynamic('_testimportmultiple_foo', pathname)
mod2 = imp.load_dynamic('_testimportmultiple_bar', pathname)
self.assertEqual(mod0.__name__, m)
self.assertEqual(mod1.__name__, '_testimportmultiple_foo')
self.assertEqual(mod2.__name__, '_testimportmultiple_bar')
with self.assertRaises(ImportError):
imp.load_dynamic('nonexistent', pathname)
@requires_load_dynamic
def test_load_dynamic_ImportError_path(self):
# Issue #1559549 added `name` and `path` attributes to ImportError
# in order to provide better detail. Issue #10854 implemented those
# attributes on import failures of extensions on Windows.
path = 'bogus file path'
name = 'extension'
with self.assertRaises(ImportError) as err:
imp.load_dynamic(name, path)
self.assertIn(path, err.exception.path)
self.assertEqual(name, err.exception.name)
@requires_load_dynamic
def test_load_module_extension_file_is_None(self):
# When loading an extension module and the file is None, open one
# on the behalf of imp.load_dynamic().
# Issue #15902
name = '_testimportmultiple'
found = imp.find_module(name)
if found[0] is not None:
found[0].close()
if found[2][2] != imp.C_EXTENSION:
self.skipTest("found module doesn't appear to be a C extension")
imp.load_module(name, None, *found[1:])
@unittest.skipIf(sys.dont_write_bytecode,
"test meaningful only when writing bytecode")
def test_bug7732(self):
with support.temp_cwd():
source = support.TESTFN + '.py'
os.mkdir(source)
self.assertRaisesRegex(ImportError, '^No module',
imp.find_module, support.TESTFN, ["."])
def test_multiple_calls_to_get_data(self):
# Issue #18755: make sure multiple calls to get_data() can succeed.
loader = imp._LoadSourceCompatibility('imp', imp.__file__,
open(imp.__file__))
loader.get_data(imp.__file__) # File should be closed
loader.get_data(imp.__file__) # Will need to create a newly opened file
class ReloadTests(unittest.TestCase):
"""Very basic tests to make sure that imp.reload() operates just like
reload()."""
def test_source(self):
# XXX (ncoghlan): It would be nice to use test.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
with support.EnvironmentVarGuard():
import os
imp.reload(os)
def test_extension(self):
with support.CleanImport('time'):
import time
imp.reload(time)
def test_builtin(self):
with support.CleanImport('marshal'):
import marshal
imp.reload(marshal)
def test_with_deleted_parent(self):
# see #18681
from html import parser
html = sys.modules.pop('html')
def cleanup():
sys.modules['html'] = html
self.addCleanup(cleanup)
with self.assertRaisesRegex(ImportError, 'html'):
imp.reload(parser)
class PEP3147Tests(unittest.TestCase):
"""Tests of PEP 3147."""
tag = imp.get_tag()
@unittest.skipUnless(sys.implementation.cache_tag is not None,
'requires sys.implementation.cache_tag not be None')
def test_cache_from_source(self):
# Given the path to a .py file, return the path to its PEP 3147
# defined .pyc file (i.e. under __pycache__).
path = os.path.join('foo', 'bar', 'baz', 'qux.py')
expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
'qux.{}.pyc'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, True), expect)
def test_cache_from_source_no_cache_tag(self):
# Non cache tag means NotImplementedError.
with support.swap_attr(sys.implementation, 'cache_tag', None):
with self.assertRaises(NotImplementedError):
imp.cache_from_source('whatever.py')
def test_cache_from_source_no_dot(self):
# Directory with a dot, filename without dot.
path = os.path.join('foo.bar', 'file')
expect = os.path.join('foo.bar', '__pycache__',
'file{}.pyc'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, True), expect)
def test_cache_from_source_optimized(self):
# Given the path to a .py file, return the path to its PEP 3147
# defined .pyo file (i.e. under __pycache__).
path = os.path.join('foo', 'bar', 'baz', 'qux.py')
expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
'qux.{}.pyo'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, False), expect)
def test_cache_from_source_cwd(self):
path = 'foo.py'
expect = os.path.join('__pycache__', 'foo.{}.pyc'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, True), expect)
def test_cache_from_source_override(self):
# When debug_override is not None, it can be any true-ish or false-ish
# value.
path = os.path.join('foo', 'bar', 'baz.py')
partial_expect = os.path.join('foo', 'bar', '__pycache__',
'baz.{}.py'.format(self.tag))
self.assertEqual(imp.cache_from_source(path, []), partial_expect + 'o')
self.assertEqual(imp.cache_from_source(path, [17]),
partial_expect + 'c')
# However if the bool-ishness can't be determined, the exception
# propagates.
class Bearish:
def __bool__(self): raise RuntimeError
with self.assertRaises(RuntimeError):
imp.cache_from_source('/foo/bar/baz.py', Bearish())
@unittest.skipUnless(os.sep == '\\' and os.altsep == '/',
'test meaningful only where os.altsep is defined')
def test_sep_altsep_and_sep_cache_from_source(self):
# Windows path and PEP 3147 where sep is right of altsep.
self.assertEqual(
imp.cache_from_source('\\foo\\bar\\baz/qux.py', True),
'\\foo\\bar\\baz\\__pycache__\\qux.{}.pyc'.format(self.tag))
@unittest.skipUnless(sys.implementation.cache_tag is not None,
'requires sys.implementation.cache_tag to not be '
'None')
def test_source_from_cache(self):
# Given the path to a PEP 3147 defined .pyc file, return the path to
# its source. This tests the good path.
path = os.path.join('foo', 'bar', 'baz', '__pycache__',
'qux.{}.pyc'.format(self.tag))
expect = os.path.join('foo', 'bar', 'baz', 'qux.py')
self.assertEqual(imp.source_from_cache(path), expect)
def test_source_from_cache_no_cache_tag(self):
# If sys.implementation.cache_tag is None, raise NotImplementedError.
path = os.path.join('blah', '__pycache__', 'whatever.pyc')
with support.swap_attr(sys.implementation, 'cache_tag', None):
with self.assertRaises(NotImplementedError):
imp.source_from_cache(path)
def test_source_from_cache_bad_path(self):
# When the path to a pyc file is not in PEP 3147 format, a ValueError
# is raised.
self.assertRaises(
ValueError, imp.source_from_cache, '/foo/bar/bazqux.pyc')
def test_source_from_cache_no_slash(self):
# No slashes at all in path -> ValueError
self.assertRaises(
ValueError, imp.source_from_cache, 'foo.cpython-32.pyc')
def test_source_from_cache_too_few_dots(self):
# Too few dots in final path component -> ValueError
self.assertRaises(
ValueError, imp.source_from_cache, '__pycache__/foo.pyc')
def test_source_from_cache_too_many_dots(self):
# Too many dots in final path component -> ValueError
self.assertRaises(
ValueError, imp.source_from_cache,
'__pycache__/foo.cpython-32.foo.pyc')
def test_source_from_cache_no__pycache__(self):
# Another problem with the path -> ValueError
self.assertRaises(
ValueError, imp.source_from_cache,
'/foo/bar/foo.cpython-32.foo.pyc')
def test_package___file__(self):
try:
m = __import__('pep3147')
except ImportError:
pass
else:
self.fail("pep3147 module already exists: %r" % (m,))
# Test that a package's __file__ points to the right source directory.
os.mkdir('pep3147')
sys.path.insert(0, os.curdir)
def cleanup():
if sys.path[0] == os.curdir:
del sys.path[0]
shutil.rmtree('pep3147')
self.addCleanup(cleanup)
# Touch the __init__.py file.
support.create_empty_file('pep3147/__init__.py')
importlib.invalidate_caches()
expected___file__ = os.sep.join(('.', 'pep3147', '__init__.py'))
m = __import__('pep3147')
self.assertEqual(m.__file__, expected___file__, (m.__file__, m.__path__, sys.path, sys.path_importer_cache))
# Ensure we load the pyc file.
support.unload('pep3147')
m = __import__('pep3147')
support.unload('pep3147')
self.assertEqual(m.__file__, expected___file__, (m.__file__, m.__path__, sys.path, sys.path_importer_cache))
class NullImporterTests(unittest.TestCase):
@unittest.skipIf(support.TESTFN_UNENCODABLE is None,
"Need an undecodeable filename")
def test_unencodeable(self):
name = support.TESTFN_UNENCODABLE
os.mkdir(name)
try:
self.assertRaises(ImportError, imp.NullImporter, name)
finally:
os.rmdir(name)
if __name__ == "__main__":
unittest.main()