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cpython/Lib/test/test_import.py

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import unittest
import os
import random
import shutil
import sys
import py_compile
import warnings
import imp
import marshal
from test.support import unlink, TESTFN, unload, run_unittest
def remove_files(name):
for f in (name + ".py",
name + ".pyc",
name + ".pyo",
name + ".pyw",
name + "$py.class"):
if os.path.exists(f):
os.remove(f)
class ImportTest(unittest.TestCase):
def testCaseSensitivity(self):
# Brief digression to test that import is case-sensitive: if we got this
# far, we know for sure that "random" exists.
try:
import RAnDoM
except ImportError:
pass
else:
self.fail("import of RAnDoM should have failed (case mismatch)")
def testDoubleConst(self):
# Another brief digression to test the accuracy of manifest float constants.
from test import double_const # don't blink -- that *was* the test
def testImport(self):
def test_with_extension(ext):
# ext normally ".py"; perhaps ".pyw"
source = TESTFN + ext
pyo = TESTFN + ".pyo"
if sys.platform.startswith('java'):
pyc = TESTFN + "$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.assertEquals(mod.a, a,
"module loaded (%s) but contents invalid" % mod)
self.assertEquals(mod.b, b,
"module loaded (%s) but contents invalid" % mod)
finally:
unlink(source)
unlink(pyc)
unlink(pyo)
del sys.modules[TESTFN]
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]
def testImpModule(self):
# Verify that the imp module can correctly load and find .py files
import imp
x = imp.find_module("os")
os = imp.load_module("os", *x)
def test_module_with_large_stack(self, module='longlist'):
# create module w/list of 65000 elements to test bug #561858
filename = module + '.py'
# create a file with a list of 65000 elements
f = open(filename, 'w+')
f.write('d = [\n')
for i in range(65000):
f.write('"",\n')
f.write(']')
f.close()
# compile & remove .py file, we only need .pyc (or .pyo)
f = open(filename, 'r')
py_compile.compile(filename)
f.close()
os.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]
for ext in '.pyc', '.pyo':
fname = module + ext
if os.path.exists(fname):
os.unlink(fname)
def test_failing_import_sticks(self):
source = TESTFN + ".py"
f = open(source, "w")
print("a = 1/0", file=f)
f.close()
# 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:
try:
mod = __import__(TESTFN)
except ZeroDivisionError:
if TESTFN in sys.modules:
self.fail("damaged module in sys.modules on %i. try" % i)
else:
self.fail("was able to import a damaged module on %i. try" % i)
finally:
sys.path.pop(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.assert_(x is test, x.__name__)
self.assert_(hasattr(test.support, "__file__"))
# import x.y.z as w binds z as w
import test.support as y
self.assert_(y is test.support, y.__name__)
def test_import_initless_directory_warning(self):
with warnings.catch_warnings():
# Just a random non-package directory we always expect to be
# somewhere in sys.path...
warnings.simplefilter('error', ImportWarning)
self.assertRaises(ImportWarning, __import__, "site-packages")
def test_failing_reload(self):
# A failing reload should leave the module object in sys.modules.
source = TESTFN + ".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.assert_(TESTFN in sys.modules, "expected module in sys.modules")
self.assertEquals(mod.a, 1, "module has wrong attribute values")
self.assertEquals(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.failIf(mod is None, "expected module to still be in sys.modules")
# We should have replaced a w/ 10, but the old b value should
# stick.
self.assertEquals(mod.a, 10, "module has wrong attribute values")
self.assertEquals(mod.b, 2, "module has wrong attribute values")
finally:
sys.path.pop(0)
remove_files(TESTFN)
if TESTFN in sys.modules:
del sys.modules[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.failUnless(mod.__file__.endswith('.py'))
os.remove(source)
del sys.modules[TESTFN]
mod = __import__(TESTFN)
ext = mod.__file__[-4:]
self.failUnless(ext in ('.pyc', '.pyo'), ext)
finally:
sys.path.pop(0)
remove_files(TESTFN)
if TESTFN in sys.modules:
del sys.modules[TESTFN]
def test_importbyfilename(self):
path = os.path.abspath(TESTFN)
try:
__import__(path)
except ImportError as err:
self.assertEqual("Import by filename is not supported.",
err.args[0])
else:
self.fail("import by path didn't raise an exception")
class TestPycRewriting(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 = 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:
del sys.modules[self.module_name]
for file_name in self.file_name, self.compiled_name:
if os.path.exists(file_name):
os.remove(file_name)
if os.path.exists(self.dir_name):
shutil.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)
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.__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):
shutil.rmtree(self.path)
sys.path = self.syspath
# http://bugs.python.org/issue1293
def test_trailing_slash(self):
f = open(os.path.join(self.path, 'test_trailing_slash.py'), 'w')
f.write("testdata = 'test_trailing_slash'")
f.close()
sys.path.append(self.path+'/')
mod = __import__("test_trailing_slash")
self.assertEqual(mod.testdata, 'test_trailing_slash')
unload("test_trailing_slash")
# http://bugs.python.org/issue3677
def _test_UNC_path(self):
f = open(os.path.join(self.path, 'test_trailing_slash.py'), 'w')
f.write("testdata = 'test_trailing_slash'")
f.close()
#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 RelativeImport(unittest.TestCase):
def tearDown(self):
try:
del sys.modules["test.relimport"]
except:
pass
def test_relimport_star(self):
# This will import * from .test_import.
from . import relimport
self.assertTrue(hasattr(relimport, "RelativeImport"))
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
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_main(verbose=None):
run_unittest(ImportTest, TestPycRewriting, PathsTests, RelativeImport)
if __name__ == '__main__':
# test needs to be a package, so we can do relative import
from test.test_import import test_main
test_main()
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