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cpython/Lib/test/test_import.py

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import errno
import imp
import marshal
import os
import py_compile
import random
import stat
import sys
import unittest
import textwrap
import shutil
from test.test_support import (unlink, TESTFN, unload, run_unittest, rmtree,
is_jython, check_warnings, EnvironmentVarGuard)
from test import symlink_support
from test import script_helper
def _files(name):
return (name + os.extsep + "py",
name + os.extsep + "pyc",
name + os.extsep + "pyo",
name + os.extsep + "pyw",
name + "$py.class")
def chmod_files(name):
for f in _files(name):
try:
os.chmod(f, 0600)
except OSError as exc:
if exc.errno != errno.ENOENT:
raise
def remove_files(name):
for f in _files(name):
unlink(f)
class ImportTests(unittest.TestCase):
def tearDown(self):
unload(TESTFN)
setUp = tearDown
def test_case_sensitivity(self):
# Brief digression to test that import is case-sensitive: if we got
# this far, we know for sure that "random" exists.
try:
import RAnDoM
except ImportError:
pass
else:
self.fail("import of RAnDoM should have failed (case mismatch)")
def test_double_const(self):
# Another brief digression to test the accuracy of manifest float
# constants.
from test import double_const # don't blink -- that *was* the test
def test_import(self):
def test_with_extension(ext):
# The extension is normally ".py", perhaps ".pyw".
source = TESTFN + ext
pyo = TESTFN + os.extsep + "pyo"
if is_jython:
pyc = TESTFN + "$py.class"
else:
pyc = TESTFN + os.extsep + "pyc"
with open(source, "w") as f:
print >> f, ("# This tests Python's ability to import a", ext,
"file.")
a = random.randrange(1000)
b = random.randrange(1000)
print >> f, "a =", a
print >> f, "b =", b
try:
mod = __import__(TESTFN)
except ImportError, err:
self.fail("import from %s failed: %s" % (ext, err))
else:
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:
unlink(source)
try:
imp.reload(mod)
except ImportError, err:
self.fail("import from .pyc/.pyo failed: %s" % err)
finally:
unlink(pyc)
unlink(pyo)
unload(TESTFN)
sys.path.insert(0, os.curdir)
try:
test_with_extension(os.extsep + "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.
oldmask = os.umask(022)
sys.path.insert(0, os.curdir)
try:
fname = TESTFN + os.extsep + "py"
f = 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 = fname + 'c'
if not os.path.exists(fn):
fn = fname + 'o'
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:
os.umask(oldmask)
remove_files(TESTFN)
unload(TESTFN)
del sys.path[0]
def test_rewrite_pyc_with_read_only_source(self):
# Issue 6074: a long time ago on posix, and more recently on Windows,
# a read only source file resulted in a read only pyc file, which
# led to problems with updating it later
sys.path.insert(0, os.curdir)
fname = TESTFN + os.extsep + "py"
try:
# Write a Python file, make it read-only and import it
with open(fname, 'w') as f:
f.write("x = 'original'\n")
# Tweak the mtime of the source to ensure pyc gets updated later
s = os.stat(fname)
os.utime(fname, (s.st_atime, s.st_mtime-100000000))
os.chmod(fname, 0400)
m1 = __import__(TESTFN)
self.assertEqual(m1.x, 'original')
# Change the file and then reimport it
os.chmod(fname, 0600)
with open(fname, 'w') as f:
f.write("x = 'rewritten'\n")
unload(TESTFN)
m2 = __import__(TESTFN)
self.assertEqual(m2.x, 'rewritten')
# Now delete the source file and check the pyc was rewritten
unlink(fname)
unload(TESTFN)
m3 = __import__(TESTFN)
self.assertEqual(m3.x, 'rewritten')
finally:
chmod_files(TESTFN)
remove_files(TESTFN)
unload(TESTFN)
del sys.path[0]
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 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
orig_path = os.path
orig_getenv = os.getenv
with EnvironmentVarGuard():
x = imp.find_module("os")
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_module_with_large_stack(self, module='longlist'):
# Regression test for http://bugs.python.org/issue561858.
filename = module + os.extsep + '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(']')
# Compile & remove .py file, we only need .pyc (or .pyo).
with open(filename, 'r') as f:
py_compile.compile(filename)
unlink(filename)
# Need to be able to load from current dir.
sys.path.append('')
# This used to crash.
exec 'import ' + module
# Cleanup.
del sys.path[-1]
unlink(filename + 'c')
unlink(filename + 'o')
def test_failing_import_sticks(self):
source = TESTFN + os.extsep + "py"
with open(source, "w") as f:
print >> f, "a = 1 // 0"
# New in 2.4, we shouldn't be able to import that no matter how often
# we try.
sys.path.insert(0, os.curdir)
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_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:
print >> f, "a = 1"
print >> f, "b = 2"
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:
print >> f, "a = 10"
print >> f, "b = 20//0"
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_infinite_reload(self):
# http://bugs.python.org/issue742342 reports that Python segfaults
# (infinite recursion in C) when faced with self-recursive reload()ing.
sys.path.insert(0, os.path.dirname(__file__))
try:
import infinite_reload
finally:
del sys.path[0]
def test_import_name_binding(self):
# import x.y.z binds x in the current namespace.
import test as x
import test.test_support
self.assertIs(x, test, x.__name__)
self.assertTrue(hasattr(test.test_support, "__file__"))
# import x.y.z as w binds z as w.
import test.test_support as y
self.assertIs(y, test.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)
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())
"""))
try:
script_helper.assert_python_ok(testfn)
finally:
unlink(testfn)
def test_bug7732(self):
source = TESTFN + '.py'
os.mkdir(source)
try:
self.assertRaises((ImportError, IOError),
imp.find_module, TESTFN, ["."])
finally:
os.rmdir(source)
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 = source + ('c' if __debug__ else 'o')
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)
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.func_code.co_filename
"""
dir_name = os.path.abspath(TESTFN)
file_name = os.path.join(dir_name, module_name) + os.extsep + "py"
compiled_name = file_name + ("c" if __debug__ else "o")
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.compiled_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.compiled_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)
mod = self.import_module()
self.assertEqual(mod.module_filename, self.compiled_name)
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.func_code
pos = constants.index(1)
constants[pos] = foreign_code
code = type(code)(code.co_argcount, 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):
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:]
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.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):
# Regression test for http://bugs.python.org/issue3221.
def check_absolute():
exec "from os import path" in ns
def check_relative():
exec "from . import relimport" in ns
# Check both OK with __package__ and __name__ correct
ns = dict(__package__='test', __name__='test.notarealmodule')
check_absolute()
check_relative()
# Check both OK with only __name__ wrong
ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
check_absolute()
check_relative()
# Check relative fails with only __package__ wrong
ns = dict(__package__='foo', __name__='test.notarealmodule')
with check_warnings(('.+foo', RuntimeWarning)):
check_absolute()
self.assertRaises(SystemError, check_relative)
# Check relative fails with __package__ and __name__ wrong
ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')
with check_warnings(('.+foo', RuntimeWarning)):
check_absolute()
self.assertRaises(SystemError, check_relative)
# Check both fail with package set to a non-string
ns = dict(__package__=object())
self.assertRaises(ValueError, check_absolute)
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 TestSymbolicallyLinkedPackage(unittest.TestCase):
package_name = 'sample'
def setUp(self):
if os.path.exists(self.tagged):
shutil.rmtree(self.tagged)
if os.path.exists(self.package_name):
symlink_support.remove_symlink(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)
init_file = os.path.join(self.tagged, '__init__.py')
open(init_file, 'w').close()
assert os.path.exists(init_file)
# now create a symlink to the tagged package
# sample -> sample-tagged
symlink_support.symlink(self.tagged, self.package_name)
assert os.path.isdir(self.package_name)
assert os.path.isfile(os.path.join(self.package_name, '__init__.py'))
@property
def tagged(self):
return self.package_name + '-tagged'
# regression test for issue6727
@unittest.skipUnless(
not hasattr(sys, 'getwindowsversion')
or sys.getwindowsversion() >= (6, 0),
"Windows Vista or later required")
@symlink_support.skip_unless_symlink
def test_symlinked_dir_importable(self):
# make sure sample can only be imported from the current directory.
sys.path[:] = ['.']
# and try to import the package
__import__(self.package_name)
def tearDown(self):
# now cleanup
if os.path.exists(self.package_name):
symlink_support.remove_symlink(self.package_name)
if os.path.exists(self.tagged):
shutil.rmtree(self.tagged)
sys.path[:] = self.orig_sys_path
def test_main(verbose=None):
run_unittest(ImportTests, PycRewritingTests, PathsTests,
RelativeImportTests, TestSymbolicallyLinkedPackage)
if __name__ == '__main__':
# Test needs to be a package, so we can do relative imports.
from test.test_import import test_main
test_main()
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