cpython/Lib/test/test_import.py

461 lines
16 KiB
Python
Raw Normal View History

2010-03-16 23:40:12 -03:00
import imp
import marshal
import os
2010-03-16 23:40:12 -03:00
import py_compile
import random
2010-03-16 23:40:12 -03:00
import stat
import sys
2010-03-16 23:40:12 -03:00
import unittest
from test.test_support import (unlink, TESTFN, unload, run_unittest, rmtree,
is_jython, check_warnings, EnvironmentVarGuard)
import textwrap
from test import script_helper
def remove_files(name):
for f in (name + os.extsep + "py",
name + os.extsep + "pyc",
name + os.extsep + "pyo",
name + os.extsep + "pyw",
name + "$py.class"):
unlink(f)
2006-09-30 09:16:03 -03:00
2010-03-16 23:40:12 -03:00
class ImportTests(unittest.TestCase):
2006-10-18 02:09:12 -03:00
def tearDown(self):
unload(TESTFN)
setUp = tearDown
2010-03-16 23:40:12 -03:00
def test_case_sensitivity(self):
# Brief digression to test that import is case-sensitive: if we got
# this far, we know for sure that "random" exists.
try:
2006-09-30 09:16:03 -03:00
import RAnDoM
except ImportError:
pass
else:
self.fail("import of RAnDoM should have failed (case mismatch)")
2010-03-16 23:40:12 -03:00
def test_double_const(self):
# Another brief digression to test the accuracy of manifest float
# constants.
2006-09-30 09:16:03 -03:00
from test import double_const # don't blink -- that *was* the test
2010-03-16 23:40:12 -03:00
def test_import(self):
2006-09-30 09:16:03 -03:00
def test_with_extension(ext):
2010-03-16 23:40:12 -03:00
# The extension is normally ".py", perhaps ".pyw".
2006-09-30 09:16:03 -03:00
source = TESTFN + ext
pyo = TESTFN + os.extsep + "pyo"
if is_jython:
2006-09-30 09:16:03 -03:00
pyc = TESTFN + "$py.class"
else:
pyc = TESTFN + os.extsep + "pyc"
2010-03-16 23:40:12 -03:00
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
2006-09-30 09:16:03 -03:00
try:
mod = __import__(TESTFN)
except ImportError, err:
self.fail("import from %s failed: %s" % (ext, err))
else:
self.assertEqual(mod.a, a,
2006-09-30 09:16:03 -03:00
"module loaded (%s) but contents invalid" % mod)
self.assertEqual(mod.b, b,
2006-09-30 09:16:03 -03:00
"module loaded (%s) but contents invalid" % mod)
finally:
unlink(source)
2006-09-30 09:16:03 -03:00
try:
imp.reload(mod)
except ImportError, err:
self.fail("import from .pyc/.pyo failed: %s" % err)
2006-09-30 09:16:03 -03:00
finally:
unlink(pyc)
unlink(pyo)
unload(TESTFN)
2006-09-30 09:16:03 -03:00
sys.path.insert(0, os.curdir)
try:
2006-09-30 09:16:03 -03:00
test_with_extension(os.extsep + "py")
if sys.platform.startswith("win"):
2010-03-16 23:40:12 -03:00
for ext in [".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw"]:
2006-09-30 09:16:03 -03:00
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)
2009-07-08 23:06:17 -03:00
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")
2009-07-08 23:06:17 -03:00
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]
2010-03-16 23:40:12 -03:00
def test_imp_module(self):
2006-09-30 09:16:03 -03:00
# 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)
2006-09-30 09:16:03 -03:00
def test_module_with_large_stack(self, module='longlist'):
2010-03-16 23:40:12 -03:00
# Regression test for http://bugs.python.org/issue561858.
2006-09-30 09:16:03 -03:00
filename = module + os.extsep + 'py'
2010-03-16 23:40:12 -03:00
# 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)
2006-09-30 09:16:03 -03:00
2010-03-16 23:40:12 -03:00
# Need to be able to load from current dir.
2006-09-30 09:16:03 -03:00
sys.path.append('')
2010-03-16 23:40:12 -03:00
# This used to crash.
2006-09-30 09:16:03 -03:00
exec 'import ' + module
2010-03-16 23:40:12 -03:00
# Cleanup.
2006-09-30 09:16:03 -03:00
del sys.path[-1]
unlink(filename + 'c')
unlink(filename + 'o')
2006-09-30 09:16:03 -03:00
def test_failing_import_sticks(self):
2006-09-30 09:16:03 -03:00
source = TESTFN + os.extsep + "py"
2010-03-16 23:40:12 -03:00
with open(source, "w") as f:
print >> f, "a = 1 // 0"
2006-09-30 09:16:03 -03:00
# 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:
2010-03-16 23:40:12 -03:00
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)
2006-09-30 09:16:03 -03:00
finally:
del sys.path[0]
2006-09-30 09:16:03 -03:00
remove_files(TESTFN)
def test_failing_reload(self):
# A failing reload should leave the module object in sys.modules.
source = TESTFN + os.extsep + "py"
2010-03-16 23:40:12 -03:00
with open(source, "w") as f:
print >> f, "a = 1"
print >> f, "b = 2"
2006-09-30 09:16:03 -03:00
sys.path.insert(0, os.curdir)
try:
2006-09-30 09:16:03 -03:00
mod = __import__(TESTFN)
2010-01-23 19:04:36 -04:00
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")
2006-09-30 09:16:03 -03:00
# 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.
2010-03-16 23:40:12 -03:00
with open(source, "w") as f:
print >> f, "a = 10"
print >> f, "b = 20//0"
2006-09-30 09:16:03 -03:00
self.assertRaises(ZeroDivisionError, imp.reload, mod)
2006-09-30 09:16:03 -03:00
# 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")
2006-09-30 09:16:03 -03:00
# 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")
2006-09-30 09:16:03 -03:00
finally:
del sys.path[0]
2006-09-30 09:16:03 -03:00
remove_files(TESTFN)
unload(TESTFN)
2007-03-12 15:07:52 -03:00
def test_infinite_reload(self):
2010-03-16 23:40:12 -03:00
# http://bugs.python.org/issue742342 reports that Python segfaults
# (infinite recursion in C) when faced with self-recursive reload()ing.
2007-03-12 15:07:52 -03:00
sys.path.insert(0, os.path.dirname(__file__))
try:
import infinite_reload
finally:
del sys.path[0]
2006-09-30 09:16:03 -03:00
def test_import_name_binding(self):
2010-03-16 23:40:12 -03:00
# import x.y.z binds x in the current namespace.
2006-09-30 09:16:03 -03:00
import test as x
import test.test_support
self.assertIs(x, test, x.__name__)
2009-06-30 19:57:08 -03:00
self.assertTrue(hasattr(test.test_support, "__file__"))
2006-09-30 09:16:03 -03:00
2010-03-16 23:40:12 -03:00
# import x.y.z as w binds z as w.
2006-09-30 09:16:03 -03:00
import test.test_support as y
self.assertIs(y, test.test_support, y.__name__)
2006-09-30 09:16:03 -03:00
def test_import_initless_directory_warning(self):
with check_warnings(('', ImportWarning)):
2006-09-30 09:16:03 -03:00
# Just a random non-package directory we always expect to be
# somewhere in sys.path...
self.assertRaises(ImportError, __import__, "site-packages")
2006-09-30 09:16:03 -03:00
2010-03-16 23:40:12 -03:00
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())
"""))
script_helper.assert_python_ok(testfn)
2010-03-16 23:40:12 -03:00
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)
2010-03-16 23:40:12 -03:00
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
2010-03-16 23:40:12 -03:00
# Regression test for http://bugs.python.org/issue1293.
def test_trailing_slash(self):
2010-03-16 23:40:12 -03:00
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")
2010-03-16 23:40:12 -03:00
# Regression test for http://bugs.python.org/issue3677.
def _test_UNC_path(self):
2010-03-16 23:40:12 -03:00
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
2010-03-16 23:40:12 -03:00
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
2010-03-16 23:40:12 -03:00
self.assertTrue(hasattr(relimport, "RelativeImportTests"))
def test_issue3221(self):
2010-03-16 23:40:12 -03:00
# 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
2010-03-16 23:40:12 -03:00
# Check both OK with __package__ and __name__ correct
ns = dict(__package__='test', __name__='test.notarealmodule')
check_absolute()
check_relative()
2010-03-16 23:40:12 -03:00
# Check both OK with only __name__ wrong
ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
check_absolute()
check_relative()
2010-03-16 23:40:12 -03:00
# 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)
2010-03-16 23:40:12 -03:00
# 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)
2010-03-16 23:40:12 -03:00
# 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")
2010-03-16 23:40:12 -03:00
2006-09-30 09:16:03 -03:00
def test_main(verbose=None):
2010-03-16 23:40:12 -03:00
run_unittest(ImportTests, PycRewritingTests, PathsTests, RelativeImportTests)
2006-09-30 09:16:03 -03:00
if __name__ == '__main__':
2010-03-16 23:40:12 -03:00
# Test needs to be a package, so we can do relative imports.
from test.test_import import test_main
2006-09-30 09:16:03 -03:00
test_main()