AppPkg/Applications/Python/Python-2.7.2/Lib/test/test_import.py

   1 import imp
   2 import marshal
   3 import os
   4 import py_compile
   5 import random
   6 import stat
   7 import sys
   8 import unittest
   9 from test.test_support import (unlink, TESTFN, unload, run_unittest, rmtree,
  10                                is_jython, check_warnings, EnvironmentVarGuard)
  11 import textwrap
  12 from test import script_helper
  13
  14 def remove_files(name):
  15     for f in (name + os.extsep + "py",
  16               name + os.extsep + "pyc",
  17               name + os.extsep + "pyo",
  18               name + os.extsep + "pyw",
  19               name + "$py.class"):
  20         unlink(f)
  21
  22
  23 class ImportTests(unittest.TestCase):
  24
  25     def tearDown(self):
  26         unload(TESTFN)
  27     setUp = tearDown
  28
  29     def test_case_sensitivity(self):
  30         # Brief digression to test that import is case-sensitive:  if we got
  31         # this far, we know for sure that "random" exists.
  32         try:
  33             import RAnDoM
  34         except ImportError:
  35             pass
  36         else:
  37             self.fail("import of RAnDoM should have failed (case mismatch)")
  38
  39     def test_double_const(self):
  40         # Another brief digression to test the accuracy of manifest float
  41         # constants.
  42         from test import double_const  # don't blink -- that *was* the test
  43
  44     def test_import(self):
  45         def test_with_extension(ext):
  46             # The extension is normally ".py", perhaps ".pyw".
  47             source = TESTFN + ext
  48             pyo = TESTFN + os.extsep + "pyo"
  49             if is_jython:
  50                 pyc = TESTFN + "$py.class"
  51             else:
  52                 pyc = TESTFN + os.extsep + "pyc"
  53
  54             with open(source, "w") as f:
  55                 print >> f, ("# This tests Python's ability to import a", ext,
  56                              "file.")
  57                 a = random.randrange(1000)
  58                 b = random.randrange(1000)
  59                 print >> f, "a =", a
  60                 print >> f, "b =", b
  61
  62             try:
  63                 mod = __import__(TESTFN)
  64             except ImportError, err:
  65                 self.fail("import from %s failed: %s" % (ext, err))
  66             else:
  67                 self.assertEqual(mod.a, a,
  68                     "module loaded (%s) but contents invalid" % mod)
  69                 self.assertEqual(mod.b, b,
  70                     "module loaded (%s) but contents invalid" % mod)
  71             finally:
  72                 unlink(source)
  73
  74             try:
  75                 imp.reload(mod)
  76             except ImportError, err:
  77                 self.fail("import from .pyc/.pyo failed: %s" % err)
  78             finally:
  79                 unlink(pyc)
  80                 unlink(pyo)
  81                 unload(TESTFN)
  82
  83         sys.path.insert(0, os.curdir)
  84         try:
  85             test_with_extension(os.extsep + "py")
  86             if sys.platform.startswith("win"):
  87                 for ext in [".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw"]:
  88                     test_with_extension(ext)
  89         finally:
  90             del sys.path[0]
  91
  92     @unittest.skipUnless(os.name == 'posix', "test meaningful only on posix systems")
  93     def test_execute_bit_not_copied(self):
  94         # Issue 6070: under posix .pyc files got their execute bit set if
  95         # the .py file had the execute bit set, but they aren't executable.
  96         oldmask = os.umask(022)
  97         sys.path.insert(0, os.curdir)
  98         try:
  99             fname = TESTFN + os.extsep + "py"
 100             f = open(fname, 'w').close()
 101             os.chmod(fname, (stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH |
 102                              stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH))
 103             __import__(TESTFN)
 104             fn = fname + 'c'
 105             if not os.path.exists(fn):
 106                 fn = fname + 'o'
 107                 if not os.path.exists(fn):
 108                     self.fail("__import__ did not result in creation of "
 109                               "either a .pyc or .pyo file")
 110             s = os.stat(fn)
 111             self.assertEqual(stat.S_IMODE(s.st_mode),
 112                              stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
 113         finally:
 114             os.umask(oldmask)
 115             remove_files(TESTFN)
 116             unload(TESTFN)
 117             del sys.path[0]
 118
 119     def test_imp_module(self):
 120         # Verify that the imp module can correctly load and find .py files
 121
 122         # XXX (ncoghlan): It would be nice to use test_support.CleanImport
 123         # here, but that breaks because the os module registers some
 124         # handlers in copy_reg on import. Since CleanImport doesn't
 125         # revert that registration, the module is left in a broken
 126         # state after reversion. Reinitialising the module contents
 127         # and just reverting os.environ to its previous state is an OK
 128         # workaround
 129         orig_path = os.path
 130         orig_getenv = os.getenv
 131         with EnvironmentVarGuard():
 132             x = imp.find_module("os")
 133             new_os = imp.load_module("os", *x)
 134             self.assertIs(os, new_os)
 135             self.assertIs(orig_path, new_os.path)
 136             self.assertIsNot(orig_getenv, new_os.getenv)
 137
 138     def test_module_with_large_stack(self, module='longlist'):
 139         # Regression test for http://bugs.python.org/issue561858.
 140         filename = module + os.extsep + 'py'
 141
 142         # Create a file with a list of 65000 elements.
 143         with open(filename, 'w+') as f:
 144             f.write('d = [\n')
 145             for i in range(65000):
 146                 f.write('"",\n')
 147             f.write(']')
 148
 149         # Compile & remove .py file, we only need .pyc (or .pyo).
 150         with open(filename, 'r') as f:
 151             py_compile.compile(filename)
 152         unlink(filename)
 153
 154         # Need to be able to load from current dir.
 155         sys.path.append('')
 156
 157         # This used to crash.
 158         exec 'import ' + module
 159
 160         # Cleanup.
 161         del sys.path[-1]
 162         unlink(filename + 'c')
 163         unlink(filename + 'o')
 164
 165     def test_failing_import_sticks(self):
 166         source = TESTFN + os.extsep + "py"
 167         with open(source, "w") as f:
 168             print >> f, "a = 1 // 0"
 169
 170         # New in 2.4, we shouldn't be able to import that no matter how often
 171         # we try.
 172         sys.path.insert(0, os.curdir)
 173         try:
 174             for i in [1, 2, 3]:
 175                 self.assertRaises(ZeroDivisionError, __import__, TESTFN)
 176                 self.assertNotIn(TESTFN, sys.modules,
 177                                  "damaged module in sys.modules on %i try" % i)
 178         finally:
 179             del sys.path[0]
 180             remove_files(TESTFN)
 181
 182     def test_failing_reload(self):
 183         # A failing reload should leave the module object in sys.modules.
 184         source = TESTFN + os.extsep + "py"
 185         with open(source, "w") as f:
 186             print >> f, "a = 1"
 187             print >> f, "b = 2"
 188
 189         sys.path.insert(0, os.curdir)
 190         try:
 191             mod = __import__(TESTFN)
 192             self.assertIn(TESTFN, sys.modules)
 193             self.assertEqual(mod.a, 1, "module has wrong attribute values")
 194             self.assertEqual(mod.b, 2, "module has wrong attribute values")
 195
 196             # On WinXP, just replacing the .py file wasn't enough to
 197             # convince reload() to reparse it.  Maybe the timestamp didn't
 198             # move enough.  We force it to get reparsed by removing the
 199             # compiled file too.
 200             remove_files(TESTFN)
 201
 202             # Now damage the module.
 203             with open(source, "w") as f:
 204                 print >> f, "a = 10"
 205                 print >> f, "b = 20//0"
 206
 207             self.assertRaises(ZeroDivisionError, imp.reload, mod)
 208
 209             # But we still expect the module to be in sys.modules.
 210             mod = sys.modules.get(TESTFN)
 211             self.assertIsNot(mod, None, "expected module to be in sys.modules")
 212
 213             # We should have replaced a w/ 10, but the old b value should
 214             # stick.
 215             self.assertEqual(mod.a, 10, "module has wrong attribute values")
 216             self.assertEqual(mod.b, 2, "module has wrong attribute values")
 217
 218         finally:
 219             del sys.path[0]
 220             remove_files(TESTFN)
 221             unload(TESTFN)
 222
 223     def test_infinite_reload(self):
 224         # http://bugs.python.org/issue742342 reports that Python segfaults
 225         # (infinite recursion in C) when faced with self-recursive reload()ing.
 226
 227         sys.path.insert(0, os.path.dirname(__file__))
 228         try:
 229             import infinite_reload
 230         finally:
 231             del sys.path[0]
 232
 233     def test_import_name_binding(self):
 234         # import x.y.z binds x in the current namespace.
 235         import test as x
 236         import test.test_support
 237         self.assertIs(x, test, x.__name__)
 238         self.assertTrue(hasattr(test.test_support, "__file__"))
 239
 240         # import x.y.z as w binds z as w.
 241         import test.test_support as y
 242         self.assertIs(y, test.test_support, y.__name__)
 243
 244     def test_import_initless_directory_warning(self):
 245         with check_warnings(('', ImportWarning)):
 246             # Just a random non-package directory we always expect to be
 247             # somewhere in sys.path...
 248             self.assertRaises(ImportError, __import__, "site-packages")
 249
 250     def test_import_by_filename(self):
 251         path = os.path.abspath(TESTFN)
 252         with self.assertRaises(ImportError) as c:
 253             __import__(path)
 254         self.assertEqual("Import by filename is not supported.",
 255                          c.exception.args[0])
 256
 257     def test_import_in_del_does_not_crash(self):
 258         # Issue 4236
 259         testfn = script_helper.make_script('', TESTFN, textwrap.dedent("""\
 260             import sys
 261             class C:
 262                def __del__(self):
 263                   import imp
 264             sys.argv.insert(0, C())
 265             """))
 266         script_helper.assert_python_ok(testfn)
 267
 268
 269 class PycRewritingTests(unittest.TestCase):
 270     # Test that the `co_filename` attribute on code objects always points
 271     # to the right file, even when various things happen (e.g. both the .py
 272     # and the .pyc file are renamed).
 273
 274     module_name = "unlikely_module_name"
 275     module_source = """
 276 import sys
 277 code_filename = sys._getframe().f_code.co_filename
 278 module_filename = __file__
 279 constant = 1
 280 def func():
 281     pass
 282 func_filename = func.func_code.co_filename
 283 """
 284     dir_name = os.path.abspath(TESTFN)
 285     file_name = os.path.join(dir_name, module_name) + os.extsep + "py"
 286     compiled_name = file_name + ("c" if __debug__ else "o")
 287
 288     def setUp(self):
 289         self.sys_path = sys.path[:]
 290         self.orig_module = sys.modules.pop(self.module_name, None)
 291         os.mkdir(self.dir_name)
 292         with open(self.file_name, "w") as f:
 293             f.write(self.module_source)
 294         sys.path.insert(0, self.dir_name)
 295
 296     def tearDown(self):
 297         sys.path[:] = self.sys_path
 298         if self.orig_module is not None:
 299             sys.modules[self.module_name] = self.orig_module
 300         else:
 301             unload(self.module_name)
 302         unlink(self.file_name)
 303         unlink(self.compiled_name)
 304         rmtree(self.dir_name)
 305
 306     def import_module(self):
 307         ns = globals()
 308         __import__(self.module_name, ns, ns)
 309         return sys.modules[self.module_name]
 310
 311     def test_basics(self):
 312         mod = self.import_module()
 313         self.assertEqual(mod.module_filename, self.file_name)
 314         self.assertEqual(mod.code_filename, self.file_name)
 315         self.assertEqual(mod.func_filename, self.file_name)
 316         del sys.modules[self.module_name]
 317         mod = self.import_module()
 318         self.assertEqual(mod.module_filename, self.compiled_name)
 319         self.assertEqual(mod.code_filename, self.file_name)
 320         self.assertEqual(mod.func_filename, self.file_name)
 321
 322     def test_incorrect_code_name(self):
 323         py_compile.compile(self.file_name, dfile="another_module.py")
 324         mod = self.import_module()
 325         self.assertEqual(mod.module_filename, self.compiled_name)
 326         self.assertEqual(mod.code_filename, self.file_name)
 327         self.assertEqual(mod.func_filename, self.file_name)
 328
 329     def test_module_without_source(self):
 330         target = "another_module.py"
 331         py_compile.compile(self.file_name, dfile=target)
 332         os.remove(self.file_name)
 333         mod = self.import_module()
 334         self.assertEqual(mod.module_filename, self.compiled_name)
 335         self.assertEqual(mod.code_filename, target)
 336         self.assertEqual(mod.func_filename, target)
 337
 338     def test_foreign_code(self):
 339         py_compile.compile(self.file_name)
 340         with open(self.compiled_name, "rb") as f:
 341             header = f.read(8)
 342             code = marshal.load(f)
 343         constants = list(code.co_consts)
 344         foreign_code = test_main.func_code
 345         pos = constants.index(1)
 346         constants[pos] = foreign_code
 347         code = type(code)(code.co_argcount, code.co_nlocals, code.co_stacksize,
 348                           code.co_flags, code.co_code, tuple(constants),
 349                           code.co_names, code.co_varnames, code.co_filename,
 350                           code.co_name, code.co_firstlineno, code.co_lnotab,
 351                           code.co_freevars, code.co_cellvars)
 352         with open(self.compiled_name, "wb") as f:
 353             f.write(header)
 354             marshal.dump(code, f)
 355         mod = self.import_module()
 356         self.assertEqual(mod.constant.co_filename, foreign_code.co_filename)
 357
 358
 359 class PathsTests(unittest.TestCase):
 360     path = TESTFN
 361
 362     def setUp(self):
 363         os.mkdir(self.path)
 364         self.syspath = sys.path[:]
 365
 366     def tearDown(self):
 367         rmtree(self.path)
 368         sys.path[:] = self.syspath
 369
 370     # Regression test for http://bugs.python.org/issue1293.
 371     def test_trailing_slash(self):
 372         with open(os.path.join(self.path, 'test_trailing_slash.py'), 'w') as f:
 373             f.write("testdata = 'test_trailing_slash'")
 374         sys.path.append(self.path+'/')
 375         mod = __import__("test_trailing_slash")
 376         self.assertEqual(mod.testdata, 'test_trailing_slash')
 377         unload("test_trailing_slash")
 378
 379     # Regression test for http://bugs.python.org/issue3677.
 380     def _test_UNC_path(self):
 381         with open(os.path.join(self.path, 'test_trailing_slash.py'), 'w') as f:
 382             f.write("testdata = 'test_trailing_slash'")
 383         # Create the UNC path, like \\myhost\c$\foo\bar.
 384         path = os.path.abspath(self.path)
 385         import socket
 386         hn = socket.gethostname()
 387         drive = path[0]
 388         unc = "\\\\%s\\%s$"%(hn, drive)
 389         unc += path[2:]
 390         sys.path.append(path)
 391         mod = __import__("test_trailing_slash")
 392         self.assertEqual(mod.testdata, 'test_trailing_slash')
 393         unload("test_trailing_slash")
 394
 395     if sys.platform == "win32":
 396         test_UNC_path = _test_UNC_path
 397
 398
 399 class RelativeImportTests(unittest.TestCase):
 400
 401     def tearDown(self):
 402         unload("test.relimport")
 403     setUp = tearDown
 404
 405     def test_relimport_star(self):
 406         # This will import * from .test_import.
 407         from . import relimport
 408         self.assertTrue(hasattr(relimport, "RelativeImportTests"))
 409
 410     def test_issue3221(self):
 411         # Regression test for http://bugs.python.org/issue3221.
 412         def check_absolute():
 413             exec "from os import path" in ns
 414         def check_relative():
 415             exec "from . import relimport" in ns
 416
 417         # Check both OK with __package__ and __name__ correct
 418         ns = dict(__package__='test', __name__='test.notarealmodule')
 419         check_absolute()
 420         check_relative()
 421
 422         # Check both OK with only __name__ wrong
 423         ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
 424         check_absolute()
 425         check_relative()
 426
 427         # Check relative fails with only __package__ wrong
 428         ns = dict(__package__='foo', __name__='test.notarealmodule')
 429         with check_warnings(('.+foo', RuntimeWarning)):
 430             check_absolute()
 431         self.assertRaises(SystemError, check_relative)
 432
 433         # Check relative fails with __package__ and __name__ wrong
 434         ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')
 435         with check_warnings(('.+foo', RuntimeWarning)):
 436             check_absolute()
 437         self.assertRaises(SystemError, check_relative)
 438
 439         # Check both fail with package set to a non-string
 440         ns = dict(__package__=object())
 441         self.assertRaises(ValueError, check_absolute)
 442         self.assertRaises(ValueError, check_relative)
 443
 444     def test_absolute_import_without_future(self):
 445         # If explicit relative import syntax is used, then do not try
 446         # to perform an absolute import in the face of failure.
 447         # Issue #7902.
 448         with self.assertRaises(ImportError):
 449             from .os import sep
 450             self.fail("explicit relative import triggered an "
 451                       "implicit absolute import")
 452
 453
 454 def test_main(verbose=None):
 455     run_unittest(ImportTests, PycRewritingTests, PathsTests, RelativeImportTests)
 456
 457 if __name__ == '__main__':
 458     # Test needs to be a package, so we can do relative imports.
 459     from test.test_import import test_main
 460     test_main()