from test import support from test.support.script_helper import assert_python_ok, assert_python_failure import builtins import codecs import gc import locale import operator import os import struct import subprocess import sys import sysconfig import test.support import textwrap import unittest import warnings # count the number of test runs, used to create unique # strings to intern in test_intern() INTERN_NUMRUNS = 0 class DisplayHookTest(unittest.TestCase): def test_original_displayhook(self): dh = sys.__displayhook__ with support.captured_stdout() as out: dh(42) self.assertEqual(out.getvalue(), "42\n") self.assertEqual(builtins._, 42) del builtins._ with support.captured_stdout() as out: dh(None) self.assertEqual(out.getvalue(), "") self.assertTrue(not hasattr(builtins, "_")) # sys.displayhook() requires arguments self.assertRaises(TypeError, dh) stdout = sys.stdout try: del sys.stdout self.assertRaises(RuntimeError, dh, 42) finally: sys.stdout = stdout def test_lost_displayhook(self): displayhook = sys.displayhook try: del sys.displayhook code = compile("42", "", "single") self.assertRaises(RuntimeError, eval, code) finally: sys.displayhook = displayhook def test_custom_displayhook(self): def baddisplayhook(obj): raise ValueError with support.swap_attr(sys, 'displayhook', baddisplayhook): code = compile("42", "", "single") self.assertRaises(ValueError, eval, code) class ExceptHookTest(unittest.TestCase): def test_original_excepthook(self): try: raise ValueError(42) except ValueError as exc: with support.captured_stderr() as err: sys.__excepthook__(*sys.exc_info()) self.assertTrue(err.getvalue().endswith("ValueError: 42\n")) self.assertRaises(TypeError, sys.__excepthook__) def test_excepthook_bytes_filename(self): # bpo-37467: sys.excepthook() must not crash if a filename # is a bytes string with warnings.catch_warnings(): warnings.simplefilter('ignore', BytesWarning) try: raise SyntaxError("msg", (b"bytes_filename", 123, 0, "text")) except SyntaxError as exc: with support.captured_stderr() as err: sys.__excepthook__(*sys.exc_info()) err = err.getvalue() self.assertIn(""" File "b'bytes_filename'", line 123\n""", err) self.assertIn(""" text\n""", err) self.assertTrue(err.endswith("SyntaxError: msg\n")) def test_excepthook(self): with test.support.captured_output("stderr") as stderr: sys.excepthook(1, '1', 1) self.assertTrue("TypeError: print_exception(): Exception expected for " \ "value, str found" in stderr.getvalue()) # FIXME: testing the code for a lost or replaced excepthook in # Python/pythonrun.c::PyErr_PrintEx() is tricky. class SysModuleTest(unittest.TestCase): def tearDown(self): test.support.reap_children() def test_exit(self): # call with two arguments self.assertRaises(TypeError, sys.exit, 42, 42) # call without argument with self.assertRaises(SystemExit) as cm: sys.exit() self.assertIsNone(cm.exception.code) rc, out, err = assert_python_ok('-c', 'import sys; sys.exit()') self.assertEqual(rc, 0) self.assertEqual(out, b'') self.assertEqual(err, b'') # call with integer argument with self.assertRaises(SystemExit) as cm: sys.exit(42) self.assertEqual(cm.exception.code, 42) # call with tuple argument with one entry # entry will be unpacked with self.assertRaises(SystemExit) as cm: sys.exit((42,)) self.assertEqual(cm.exception.code, 42) # call with string argument with self.assertRaises(SystemExit) as cm: sys.exit("exit") self.assertEqual(cm.exception.code, "exit") # call with tuple argument with two entries with self.assertRaises(SystemExit) as cm: sys.exit((17, 23)) self.assertEqual(cm.exception.code, (17, 23)) # test that the exit machinery handles SystemExits properly rc, out, err = assert_python_failure('-c', 'raise SystemExit(47)') self.assertEqual(rc, 47) self.assertEqual(out, b'') self.assertEqual(err, b'') def check_exit_message(code, expected, **env_vars): rc, out, err = assert_python_failure('-c', code, **env_vars) self.assertEqual(rc, 1) self.assertEqual(out, b'') self.assertTrue(err.startswith(expected), "%s doesn't start with %s" % (ascii(err), ascii(expected))) # test that stderr buffer is flushed before the exit message is written # into stderr check_exit_message( r'import sys; sys.stderr.write("unflushed,"); sys.exit("message")', b"unflushed,message") # test that the exit message is written with backslashreplace error # handler to stderr check_exit_message( r'import sys; sys.exit("surrogates:\uDCFF")', b"surrogates:\\udcff") # test that the unicode message is encoded to the stderr encoding # instead of the default encoding (utf8) check_exit_message( r'import sys; sys.exit("h\xe9")', b"h\xe9", PYTHONIOENCODING='latin-1') def test_getdefaultencoding(self): self.assertRaises(TypeError, sys.getdefaultencoding, 42) # can't check more than the type, as the user might have changed it self.assertIsInstance(sys.getdefaultencoding(), str) # testing sys.settrace() is done in test_sys_settrace.py # testing sys.setprofile() is done in test_sys_setprofile.py def test_switchinterval(self): self.assertRaises(TypeError, sys.setswitchinterval) self.assertRaises(TypeError, sys.setswitchinterval, "a") self.assertRaises(ValueError, sys.setswitchinterval, -1.0) self.assertRaises(ValueError, sys.setswitchinterval, 0.0) orig = sys.getswitchinterval() # sanity check self.assertTrue(orig < 0.5, orig) try: for n in 0.00001, 0.05, 3.0, orig: sys.setswitchinterval(n) self.assertAlmostEqual(sys.getswitchinterval(), n) finally: sys.setswitchinterval(orig) def test_recursionlimit(self): self.assertRaises(TypeError, sys.getrecursionlimit, 42) oldlimit = sys.getrecursionlimit() self.assertRaises(TypeError, sys.setrecursionlimit) self.assertRaises(ValueError, sys.setrecursionlimit, -42) sys.setrecursionlimit(10000) self.assertEqual(sys.getrecursionlimit(), 10000) sys.setrecursionlimit(oldlimit) def test_recursionlimit_recovery(self): if hasattr(sys, 'gettrace') and sys.gettrace(): self.skipTest('fatal error if run with a trace function') oldlimit = sys.getrecursionlimit() def f(): f() try: for depth in (10, 25, 50, 75, 100, 250, 1000): try: sys.setrecursionlimit(depth) except RecursionError: # Issue #25274: The recursion limit is too low at the # current recursion depth continue # Issue #5392: test stack overflow after hitting recursion # limit twice self.assertRaises(RecursionError, f) self.assertRaises(RecursionError, f) finally: sys.setrecursionlimit(oldlimit) @test.support.cpython_only def test_setrecursionlimit_recursion_depth(self): # Issue #25274: Setting a low recursion limit must be blocked if the # current recursion depth is already higher than the "lower-water # mark". Otherwise, it may not be possible anymore to # reset the overflowed flag to 0. from _testcapi import get_recursion_depth def set_recursion_limit_at_depth(depth, limit): recursion_depth = get_recursion_depth() if recursion_depth >= depth: with self.assertRaises(RecursionError) as cm: sys.setrecursionlimit(limit) self.assertRegex(str(cm.exception), "cannot set the recursion limit to [0-9]+ " "at the recursion depth [0-9]+: " "the limit is too low") else: set_recursion_limit_at_depth(depth, limit) oldlimit = sys.getrecursionlimit() try: sys.setrecursionlimit(1000) for limit in (10, 25, 50, 75, 100, 150, 200): # formula extracted from _Py_RecursionLimitLowerWaterMark() if limit > 200: depth = limit - 50 else: depth = limit * 3 // 4 set_recursion_limit_at_depth(depth, limit) finally: sys.setrecursionlimit(oldlimit) def test_recursionlimit_fatalerror(self): # A fatal error occurs if a second recursion limit is hit when recovering # from a first one. code = textwrap.dedent(""" import sys def f(): try: f() except RecursionError: f() sys.setrecursionlimit(%d) f()""") with test.support.SuppressCrashReport(): for i in (50, 1000): sub = subprocess.Popen([sys.executable, '-c', code % i], stderr=subprocess.PIPE) err = sub.communicate()[1] self.assertTrue(sub.returncode, sub.returncode) self.assertIn( b"Fatal Python error: Cannot recover from stack overflow", err) def test_getwindowsversion(self): # Raise SkipTest if sys doesn't have getwindowsversion attribute test.support.get_attribute(sys, "getwindowsversion") v = sys.getwindowsversion() self.assertEqual(len(v), 5) self.assertIsInstance(v[0], int) self.assertIsInstance(v[1], int) self.assertIsInstance(v[2], int) self.assertIsInstance(v[3], int) self.assertIsInstance(v[4], str) self.assertRaises(IndexError, operator.getitem, v, 5) self.assertIsInstance(v.major, int) self.assertIsInstance(v.minor, int) self.assertIsInstance(v.build, int) self.assertIsInstance(v.platform, int) self.assertIsInstance(v.service_pack, str) self.assertIsInstance(v.service_pack_minor, int) self.assertIsInstance(v.service_pack_major, int) self.assertIsInstance(v.suite_mask, int) self.assertIsInstance(v.product_type, int) self.assertEqual(v[0], v.major) self.assertEqual(v[1], v.minor) self.assertEqual(v[2], v.build) self.assertEqual(v[3], v.platform) self.assertEqual(v[4], v.service_pack) # This is how platform.py calls it. Make sure tuple # still has 5 elements maj, min, buildno, plat, csd = sys.getwindowsversion() def test_call_tracing(self): self.assertRaises(TypeError, sys.call_tracing, type, 2) @unittest.skipUnless(hasattr(sys, "setdlopenflags"), 'test needs sys.setdlopenflags()') def test_dlopenflags(self): self.assertTrue(hasattr(sys, "getdlopenflags")) self.assertRaises(TypeError, sys.getdlopenflags, 42) oldflags = sys.getdlopenflags() self.assertRaises(TypeError, sys.setdlopenflags) sys.setdlopenflags(oldflags+1) self.assertEqual(sys.getdlopenflags(), oldflags+1) sys.setdlopenflags(oldflags) @test.support.refcount_test def test_refcount(self): # n here must be a global in order for this test to pass while # tracing with a python function. Tracing calls PyFrame_FastToLocals # which will add a copy of any locals to the frame object, causing # the reference count to increase by 2 instead of 1. global n self.assertRaises(TypeError, sys.getrefcount) c = sys.getrefcount(None) n = None self.assertEqual(sys.getrefcount(None), c+1) del n self.assertEqual(sys.getrefcount(None), c) if hasattr(sys, "gettotalrefcount"): self.assertIsInstance(sys.gettotalrefcount(), int) def test_getframe(self): self.assertRaises(TypeError, sys._getframe, 42, 42) self.assertRaises(ValueError, sys._getframe, 2000000000) self.assertTrue( SysModuleTest.test_getframe.__code__ \ is sys._getframe().f_code ) # sys._current_frames() is a CPython-only gimmick. @test.support.reap_threads def test_current_frames(self): import threading import traceback # Spawn a thread that blocks at a known place. Then the main # thread does sys._current_frames(), and verifies that the frames # returned make sense. entered_g = threading.Event() leave_g = threading.Event() thread_info = [] # the thread's id def f123(): g456() def g456(): thread_info.append(threading.get_ident()) entered_g.set() leave_g.wait() t = threading.Thread(target=f123) t.start() entered_g.wait() # At this point, t has finished its entered_g.set(), although it's # impossible to guess whether it's still on that line or has moved on # to its leave_g.wait(). self.assertEqual(len(thread_info), 1) thread_id = thread_info[0] d = sys._current_frames() for tid in d: self.assertIsInstance(tid, int) self.assertGreater(tid, 0) main_id = threading.get_ident() self.assertIn(main_id, d) self.assertIn(thread_id, d) # Verify that the captured main-thread frame is _this_ frame. frame = d.pop(main_id) self.assertTrue(frame is sys._getframe()) # Verify that the captured thread frame is blocked in g456, called # from f123. This is a litte tricky, since various bits of # threading.py are also in the thread's call stack. frame = d.pop(thread_id) stack = traceback.extract_stack(frame) for i, (filename, lineno, funcname, sourceline) in enumerate(stack): if funcname == "f123": break else: self.fail("didn't find f123() on thread's call stack") self.assertEqual(sourceline, "g456()") # And the next record must be for g456(). filename, lineno, funcname, sourceline = stack[i+1] self.assertEqual(funcname, "g456") self.assertIn(sourceline, ["leave_g.wait()", "entered_g.set()"]) # Reap the spawned thread. leave_g.set() t.join() def test_attributes(self): self.assertIsInstance(sys.api_version, int) self.assertIsInstance(sys.argv, list) self.assertIn(sys.byteorder, ("little", "big")) self.assertIsInstance(sys.builtin_module_names, tuple) self.assertIsInstance(sys.copyright, str) self.assertIsInstance(sys.exec_prefix, str) self.assertIsInstance(sys.base_exec_prefix, str) self.assertIsInstance(sys.executable, str) self.assertEqual(len(sys.float_info), 11) self.assertEqual(sys.float_info.radix, 2) self.assertEqual(len(sys.int_info), 2) self.assertTrue(sys.int_info.bits_per_digit % 5 == 0) self.assertTrue(sys.int_info.sizeof_digit >= 1) self.assertEqual(type(sys.int_info.bits_per_digit), int) self.assertEqual(type(sys.int_info.sizeof_digit), int) self.assertIsInstance(sys.hexversion, int) self.assertEqual(len(sys.hash_info), 9) self.assertLess(sys.hash_info.modulus, 2**sys.hash_info.width) # sys.hash_info.modulus should be a prime; we do a quick # probable primality test (doesn't exclude the possibility of # a Carmichael number) for x in range(1, 100): self.assertEqual( pow(x, sys.hash_info.modulus-1, sys.hash_info.modulus), 1, "sys.hash_info.modulus {} is a non-prime".format( sys.hash_info.modulus) ) self.assertIsInstance(sys.hash_info.inf, int) self.assertIsInstance(sys.hash_info.nan, int) self.assertIsInstance(sys.hash_info.imag, int) algo = sysconfig.get_config_var("Py_HASH_ALGORITHM") if sys.hash_info.algorithm in {"fnv", "siphash24"}: self.assertIn(sys.hash_info.hash_bits, {32, 64}) self.assertIn(sys.hash_info.seed_bits, {32, 64, 128}) if algo == 1: self.assertEqual(sys.hash_info.algorithm, "siphash24") elif algo == 2: self.assertEqual(sys.hash_info.algorithm, "fnv") else: self.assertIn(sys.hash_info.algorithm, {"fnv", "siphash24"}) else: # PY_HASH_EXTERNAL self.assertEqual(algo, 0) self.assertGreaterEqual(sys.hash_info.cutoff, 0) self.assertLess(sys.hash_info.cutoff, 8) self.assertIsInstance(sys.maxsize, int) self.assertIsInstance(sys.maxunicode, int) self.assertEqual(sys.maxunicode, 0x10FFFF) self.assertIsInstance(sys.platform, str) self.assertIsInstance(sys.prefix, str) self.assertIsInstance(sys.base_prefix, str) self.assertIsInstance(sys.version, str) vi = sys.version_info self.assertIsInstance(vi[:], tuple) self.assertEqual(len(vi), 5) self.assertIsInstance(vi[0], int) self.assertIsInstance(vi[1], int) self.assertIsInstance(vi[2], int) self.assertIn(vi[3], ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi[4], int) self.assertIsInstance(vi.major, int) self.assertIsInstance(vi.minor, int) self.assertIsInstance(vi.micro, int) self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final")) self.assertIsInstance(vi.serial, int) self.assertEqual(vi[0], vi.major) self.assertEqual(vi[1], vi.minor) self.assertEqual(vi[2], vi.micro) self.assertEqual(vi[3], vi.releaselevel) self.assertEqual(vi[4], vi.serial) self.assertTrue(vi > (1,0,0)) self.assertIsInstance(sys.float_repr_style, str) self.assertIn(sys.float_repr_style, ('short', 'legacy')) if not sys.platform.startswith('win'): self.assertIsInstance(sys.abiflags, str) def test_thread_info(self): info = sys.thread_info self.assertEqual(len(info), 3) self.assertIn(info.name, ('nt', 'pthread', 'solaris', None)) self.assertIn(info.lock, ('semaphore', 'mutex+cond', None)) def test_43581(self): # Can't use sys.stdout, as this is a StringIO object when # the test runs under regrtest. self.assertEqual(sys.__stdout__.encoding, sys.__stderr__.encoding) def test_intern(self): global INTERN_NUMRUNS INTERN_NUMRUNS += 1 self.assertRaises(TypeError, sys.intern) s = "never interned before" + str(INTERN_NUMRUNS) self.assertTrue(sys.intern(s) is s) s2 = s.swapcase().swapcase() self.assertTrue(sys.intern(s2) is s) # Subclasses of string can't be interned, because they # provide too much opportunity for insane things to happen. # We don't want them in the interned dict and if they aren't # actually interned, we don't want to create the appearance # that they are by allowing intern() to succeed. class S(str): def __hash__(self): return 123 self.assertRaises(TypeError, sys.intern, S("abc")) def test_sys_flags(self): self.assertTrue(sys.flags) attrs = ("debug", "inspect", "interactive", "optimize", "dont_write_bytecode", "no_user_site", "no_site", "ignore_environment", "verbose", "bytes_warning", "quiet", "hash_randomization", "isolated", "dev_mode", "utf8_mode") for attr in attrs: self.assertTrue(hasattr(sys.flags, attr), attr) attr_type = bool if attr == "dev_mode" else int self.assertEqual(type(getattr(sys.flags, attr)), attr_type, attr) self.assertTrue(repr(sys.flags)) self.assertEqual(len(sys.flags), len(attrs)) self.assertIn(sys.flags.utf8_mode, {0, 1, 2}) def assert_raise_on_new_sys_type(self, sys_attr): # Users are intentionally prevented from creating new instances of # sys.flags, sys.version_info, and sys.getwindowsversion. attr_type = type(sys_attr) with self.assertRaises(TypeError): attr_type() with self.assertRaises(TypeError): attr_type.__new__(attr_type) def test_sys_flags_no_instantiation(self): self.assert_raise_on_new_sys_type(sys.flags) def test_sys_version_info_no_instantiation(self): self.assert_raise_on_new_sys_type(sys.version_info) def test_sys_getwindowsversion_no_instantiation(self): # Skip if not being run on Windows. test.support.get_attribute(sys, "getwindowsversion") self.assert_raise_on_new_sys_type(sys.getwindowsversion()) @test.support.cpython_only def test_clear_type_cache(self): sys._clear_type_cache() def test_ioencoding(self): env = dict(os.environ) # Test character: cent sign, encoded as 0x4A (ASCII J) in CP424, # not representable in ASCII. env["PYTHONIOENCODING"] = "cp424" p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'], stdout = subprocess.PIPE, env=env) out = p.communicate()[0].strip() expected = ("\xa2" + os.linesep).encode("cp424") self.assertEqual(out, expected) env["PYTHONIOENCODING"] = "ascii:replace" p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'], stdout = subprocess.PIPE, env=env) out = p.communicate()[0].strip() self.assertEqual(out, b'?') env["PYTHONIOENCODING"] = "ascii" p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env) out, err = p.communicate() self.assertEqual(out, b'') self.assertIn(b'UnicodeEncodeError:', err) self.assertIn(rb"'\xa2'", err) env["PYTHONIOENCODING"] = "ascii:" p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env) out, err = p.communicate() self.assertEqual(out, b'') self.assertIn(b'UnicodeEncodeError:', err) self.assertIn(rb"'\xa2'", err) env["PYTHONIOENCODING"] = ":surrogateescape" p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xdcbd))'], stdout=subprocess.PIPE, env=env) out = p.communicate()[0].strip() self.assertEqual(out, b'\xbd') @unittest.skipUnless(test.support.FS_NONASCII, 'requires OS support of non-ASCII encodings') @unittest.skipUnless(sys.getfilesystemencoding() == locale.getpreferredencoding(False), 'requires FS encoding to match locale') def test_ioencoding_nonascii(self): env = dict(os.environ) env["PYTHONIOENCODING"] = "" p = subprocess.Popen([sys.executable, "-c", 'print(%a)' % test.support.FS_NONASCII], stdout=subprocess.PIPE, env=env) out = p.communicate()[0].strip() self.assertEqual(out, os.fsencode(test.support.FS_NONASCII)) @unittest.skipIf(sys.base_prefix != sys.prefix, 'Test is not venv-compatible') def test_executable(self): # sys.executable should be absolute self.assertEqual(os.path.abspath(sys.executable), sys.executable) # Issue #7774: Ensure that sys.executable is an empty string if argv[0] # has been set to a non existent program name and Python is unable to # retrieve the real program name # For a normal installation, it should work without 'cwd' # argument. For test runs in the build directory, see #7774. python_dir = os.path.dirname(os.path.realpath(sys.executable)) p = subprocess.Popen( ["nonexistent", "-c", 'import sys; print(sys.executable.encode("ascii", "backslashreplace"))'], executable=sys.executable, stdout=subprocess.PIPE, cwd=python_dir) stdout = p.communicate()[0] executable = stdout.strip().decode("ASCII") p.wait() self.assertIn(executable, ["b''", repr(sys.executable.encode("ascii", "backslashreplace"))]) def check_fsencoding(self, fs_encoding, expected=None): self.assertIsNotNone(fs_encoding) codecs.lookup(fs_encoding) if expected: self.assertEqual(fs_encoding, expected) def test_getfilesystemencoding(self): fs_encoding = sys.getfilesystemencoding() if sys.platform == 'darwin': expected = 'utf-8' else: expected = None self.check_fsencoding(fs_encoding, expected) def c_locale_get_error_handler(self, locale, isolated=False, encoding=None): # Force the POSIX locale env = os.environ.copy() env["LC_ALL"] = locale env["PYTHONCOERCECLOCALE"] = "0" code = '\n'.join(( 'import sys', 'def dump(name):', ' std = getattr(sys, name)', ' print("%s: %s" % (name, std.errors))', 'dump("stdin")', 'dump("stdout")', 'dump("stderr")', )) args = [sys.executable, "-X", "utf8=0", "-c", code] if isolated: args.append("-I") if encoding is not None: env['PYTHONIOENCODING'] = encoding else: env.pop('PYTHONIOENCODING', None) p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env, universal_newlines=True) stdout, stderr = p.communicate() return stdout def check_locale_surrogateescape(self, locale): out = self.c_locale_get_error_handler(locale, isolated=True) self.assertEqual(out, 'stdin: surrogateescape\n' 'stdout: surrogateescape\n' 'stderr: backslashreplace\n') # replace the default error handler out = self.c_locale_get_error_handler(locale, encoding=':ignore') self.assertEqual(out, 'stdin: ignore\n' 'stdout: ignore\n' 'stderr: backslashreplace\n') # force the encoding out = self.c_locale_get_error_handler(locale, encoding='iso8859-1') self.assertEqual(out, 'stdin: strict\n' 'stdout: strict\n' 'stderr: backslashreplace\n') out = self.c_locale_get_error_handler(locale, encoding='iso8859-1:') self.assertEqual(out, 'stdin: strict\n' 'stdout: strict\n' 'stderr: backslashreplace\n') # have no any effect out = self.c_locale_get_error_handler(locale, encoding=':') self.assertEqual(out, 'stdin: surrogateescape\n' 'stdout: surrogateescape\n' 'stderr: backslashreplace\n') out = self.c_locale_get_error_handler(locale, encoding='') self.assertEqual(out, 'stdin: surrogateescape\n' 'stdout: surrogateescape\n' 'stderr: backslashreplace\n') def test_c_locale_surrogateescape(self): self.check_locale_surrogateescape('C') def test_posix_locale_surrogateescape(self): self.check_locale_surrogateescape('POSIX') def test_implementation(self): # This test applies to all implementations equally. levels = {'alpha': 0xA, 'beta': 0xB, 'candidate': 0xC, 'final': 0xF} self.assertTrue(hasattr(sys.implementation, 'name')) self.assertTrue(hasattr(sys.implementation, 'version')) self.assertTrue(hasattr(sys.implementation, 'hexversion')) self.assertTrue(hasattr(sys.implementation, 'cache_tag')) version = sys.implementation.version self.assertEqual(version[:2], (version.major, version.minor)) hexversion = (version.major << 24 | version.minor << 16 | version.micro << 8 | levels[version.releaselevel] << 4 | version.serial << 0) self.assertEqual(sys.implementation.hexversion, hexversion) # PEP 421 requires that .name be lower case. self.assertEqual(sys.implementation.name, sys.implementation.name.lower()) @test.support.cpython_only def test_debugmallocstats(self): # Test sys._debugmallocstats() from test.support.script_helper import assert_python_ok args = ['-c', 'import sys; sys._debugmallocstats()'] ret, out, err = assert_python_ok(*args) self.assertIn(b"free PyDictObjects", err) # The function has no parameter self.assertRaises(TypeError, sys._debugmallocstats, True) @unittest.skipUnless(hasattr(sys, "getallocatedblocks"), "sys.getallocatedblocks unavailable on this build") def test_getallocatedblocks(self): try: import _testcapi except ImportError: with_pymalloc = support.with_pymalloc() else: try: alloc_name = _testcapi.pymem_getallocatorsname() except RuntimeError as exc: # "cannot get allocators name" (ex: tracemalloc is used) with_pymalloc = True else: with_pymalloc = (alloc_name in ('pymalloc', 'pymalloc_debug')) # Some sanity checks a = sys.getallocatedblocks() self.assertIs(type(a), int) if with_pymalloc: self.assertGreater(a, 0) else: # When WITH_PYMALLOC isn't available, we don't know anything # about the underlying implementation: the function might # return 0 or something greater. self.assertGreaterEqual(a, 0) try: # While we could imagine a Python session where the number of # multiple buffer objects would exceed the sharing of references, # it is unlikely to happen in a normal test run. self.assertLess(a, sys.gettotalrefcount()) except AttributeError: # gettotalrefcount() not available pass gc.collect() b = sys.getallocatedblocks() self.assertLessEqual(b, a) gc.collect() c = sys.getallocatedblocks() self.assertIn(c, range(b - 50, b + 50)) def test_is_finalizing(self): self.assertIs(sys.is_finalizing(), False) # Don't use the atexit module because _Py_Finalizing is only set # after calling atexit callbacks code = """if 1: import sys class AtExit: is_finalizing = sys.is_finalizing print = print def __del__(self): self.print(self.is_finalizing(), flush=True) # Keep a reference in the __main__ module namespace, so the # AtExit destructor will be called at Python exit ref = AtExit() """ rc, stdout, stderr = assert_python_ok('-c', code) self.assertEqual(stdout.rstrip(), b'True') def test_issue20602(self): # sys.flags and sys.float_info were wiped during shutdown. code = """if 1: import sys class A: def __del__(self, sys=sys): print(sys.flags) print(sys.float_info) a = A() """ rc, out, err = assert_python_ok('-c', code) out = out.splitlines() self.assertIn(b'sys.flags', out[0]) self.assertIn(b'sys.float_info', out[1]) def test_sys_ignores_cleaning_up_user_data(self): code = """if 1: import struct, sys class C: def __init__(self): self.pack = struct.pack def __del__(self): self.pack('I', -42) sys.x = C() """ rc, stdout, stderr = assert_python_ok('-c', code) self.assertEqual(rc, 0) self.assertEqual(stdout.rstrip(), b"") self.assertEqual(stderr.rstrip(), b"") @unittest.skipUnless(hasattr(sys, 'getandroidapilevel'), 'need sys.getandroidapilevel()') def test_getandroidapilevel(self): level = sys.getandroidapilevel() self.assertIsInstance(level, int) self.assertGreater(level, 0) def test_sys_tracebacklimit(self): code = """if 1: import sys def f1(): 1 / 0 def f2(): f1() sys.tracebacklimit = %r f2() """ def check(tracebacklimit, expected): p = subprocess.Popen([sys.executable, '-c', code % tracebacklimit], stderr=subprocess.PIPE) out = p.communicate()[1] self.assertEqual(out.splitlines(), expected) traceback = [ b'Traceback (most recent call last):', b' File "", line 8, in ', b' File "", line 6, in f2', b' File "", line 4, in f1', b'ZeroDivisionError: division by zero' ] check(10, traceback) check(3, traceback) check(2, traceback[:1] + traceback[2:]) check(1, traceback[:1] + traceback[3:]) check(0, [traceback[-1]]) check(-1, [traceback[-1]]) check(1<<1000, traceback) check(-1<<1000, [traceback[-1]]) check(None, traceback) def test_no_duplicates_in_meta_path(self): self.assertEqual(len(sys.meta_path), len(set(sys.meta_path))) @unittest.skipUnless(hasattr(sys, "_enablelegacywindowsfsencoding"), 'needs sys._enablelegacywindowsfsencoding()') def test__enablelegacywindowsfsencoding(self): code = ('import sys', 'sys._enablelegacywindowsfsencoding()', 'print(sys.getfilesystemencoding(), sys.getfilesystemencodeerrors())') rc, out, err = assert_python_ok('-c', '; '.join(code)) out = out.decode('ascii', 'replace').rstrip() self.assertEqual(out, 'mbcs replace') @test.support.cpython_only class UnraisableHookTest(unittest.TestCase): def write_unraisable_exc(self, exc, err_msg, obj): import _testcapi import types err_msg2 = f"Exception ignored {err_msg}" try: _testcapi.write_unraisable_exc(exc, err_msg, obj) return types.SimpleNamespace(exc_type=type(exc), exc_value=exc, exc_traceback=exc.__traceback__, err_msg=err_msg2, object=obj) finally: # Explicitly break any reference cycle exc = None def test_original_unraisablehook(self): for err_msg in (None, "original hook"): with self.subTest(err_msg=err_msg): obj = "an object" with test.support.captured_output("stderr") as stderr: with test.support.swap_attr(sys, 'unraisablehook', sys.__unraisablehook__): self.write_unraisable_exc(ValueError(42), err_msg, obj) err = stderr.getvalue() if err_msg is not None: self.assertIn(f'Exception ignored {err_msg}: {obj!r}\n', err) else: self.assertIn(f'Exception ignored in: {obj!r}\n', err) self.assertIn('Traceback (most recent call last):\n', err) self.assertIn('ValueError: 42\n', err) def test_original_unraisablehook_err(self): # bpo-22836: PyErr_WriteUnraisable() should give sensible reports class BrokenDel: def __del__(self): exc = ValueError("del is broken") # The following line is included in the traceback report: raise exc class BrokenStrException(Exception): def __str__(self): raise Exception("str() is broken") class BrokenExceptionDel: def __del__(self): exc = BrokenStrException() # The following line is included in the traceback report: raise exc for test_class in (BrokenDel, BrokenExceptionDel): with self.subTest(test_class): obj = test_class() with test.support.captured_stderr() as stderr, \ test.support.swap_attr(sys, 'unraisablehook', sys.__unraisablehook__): # Trigger obj.__del__() del obj report = stderr.getvalue() self.assertIn("Exception ignored", report) self.assertIn(test_class.__del__.__qualname__, report) self.assertIn("test_sys.py", report) self.assertIn("raise exc", report) if test_class is BrokenExceptionDel: self.assertIn("BrokenStrException", report) self.assertIn("", report) else: self.assertIn("ValueError", report) self.assertIn("del is broken", report) self.assertTrue(report.endswith("\n")) def test_original_unraisablehook_wrong_type(self): exc = ValueError(42) with test.support.swap_attr(sys, 'unraisablehook', sys.__unraisablehook__): with self.assertRaises(TypeError): sys.unraisablehook(exc) def test_custom_unraisablehook(self): hook_args = None def hook_func(args): nonlocal hook_args hook_args = args obj = object() try: with test.support.swap_attr(sys, 'unraisablehook', hook_func): expected = self.write_unraisable_exc(ValueError(42), "custom hook", obj) for attr in "exc_type exc_value exc_traceback err_msg object".split(): self.assertEqual(getattr(hook_args, attr), getattr(expected, attr), (hook_args, expected)) finally: # expected and hook_args contain an exception: break reference cycle expected = None hook_args = None def test_custom_unraisablehook_fail(self): def hook_func(*args): raise Exception("hook_func failed") with test.support.captured_output("stderr") as stderr: with test.support.swap_attr(sys, 'unraisablehook', hook_func): self.write_unraisable_exc(ValueError(42), "custom hook fail", None) err = stderr.getvalue() self.assertIn(f'Exception ignored in sys.unraisablehook: ' f'{hook_func!r}\n', err) self.assertIn('Traceback (most recent call last):\n', err) self.assertIn('Exception: hook_func failed\n', err) @test.support.cpython_only class SizeofTest(unittest.TestCase): def setUp(self): self.P = struct.calcsize('P') self.longdigit = sys.int_info.sizeof_digit import _testcapi self.gc_headsize = _testcapi.SIZEOF_PYGC_HEAD check_sizeof = test.support.check_sizeof def test_gc_head_size(self): # Check that the gc header size is added to objects tracked by the gc. vsize = test.support.calcvobjsize gc_header_size = self.gc_headsize # bool objects are not gc tracked self.assertEqual(sys.getsizeof(True), vsize('') + self.longdigit) # but lists are self.assertEqual(sys.getsizeof([]), vsize('Pn') + gc_header_size) def test_errors(self): class BadSizeof: def __sizeof__(self): raise ValueError self.assertRaises(ValueError, sys.getsizeof, BadSizeof()) class InvalidSizeof: def __sizeof__(self): return None self.assertRaises(TypeError, sys.getsizeof, InvalidSizeof()) sentinel = ["sentinel"] self.assertIs(sys.getsizeof(InvalidSizeof(), sentinel), sentinel) class FloatSizeof: def __sizeof__(self): return 4.5 self.assertRaises(TypeError, sys.getsizeof, FloatSizeof()) self.assertIs(sys.getsizeof(FloatSizeof(), sentinel), sentinel) class OverflowSizeof(int): def __sizeof__(self): return int(self) self.assertEqual(sys.getsizeof(OverflowSizeof(sys.maxsize)), sys.maxsize + self.gc_headsize) with self.assertRaises(OverflowError): sys.getsizeof(OverflowSizeof(sys.maxsize + 1)) with self.assertRaises(ValueError): sys.getsizeof(OverflowSizeof(-1)) with self.assertRaises((ValueError, OverflowError)): sys.getsizeof(OverflowSizeof(-sys.maxsize - 1)) def test_default(self): size = test.support.calcvobjsize self.assertEqual(sys.getsizeof(True), size('') + self.longdigit) self.assertEqual(sys.getsizeof(True, -1), size('') + self.longdigit) def test_objecttypes(self): # check all types defined in Objects/ calcsize = struct.calcsize size = test.support.calcobjsize vsize = test.support.calcvobjsize check = self.check_sizeof # bool check(True, vsize('') + self.longdigit) # buffer # XXX # builtin_function_or_method check(len, size('5P')) # bytearray samples = [b'', b'u'*100000] for sample in samples: x = bytearray(sample) check(x, vsize('n2Pi') + x.__alloc__()) # bytearray_iterator check(iter(bytearray()), size('nP')) # bytes check(b'', vsize('n') + 1) check(b'x' * 10, vsize('n') + 11) # cell def get_cell(): x = 42 def inner(): return x return inner check(get_cell().__closure__[0], size('P')) # code def check_code_size(a, expected_size): self.assertGreaterEqual(sys.getsizeof(a), expected_size) check_code_size(get_cell().__code__, size('6i13P')) check_code_size(get_cell.__code__, size('6i13P')) def get_cell2(x): def inner(): return x return inner check_code_size(get_cell2.__code__, size('6i13P') + calcsize('n')) # complex check(complex(0,1), size('2d')) # method_descriptor (descriptor object) check(str.lower, size('3PPP')) # classmethod_descriptor (descriptor object) # XXX # member_descriptor (descriptor object) import datetime check(datetime.timedelta.days, size('3PP')) # getset_descriptor (descriptor object) import collections check(collections.defaultdict.default_factory, size('3PP')) # wrapper_descriptor (descriptor object) check(int.__add__, size('3P2P')) # method-wrapper (descriptor object) check({}.__iter__, size('2P')) # empty dict check({}, size('nQ2P')) # dict check({"a": 1}, size('nQ2P') + calcsize('2nP2n') + 8 + (8*2//3)*calcsize('n2P')) longdict = {1:1, 2:2, 3:3, 4:4, 5:5, 6:6, 7:7, 8:8} check(longdict, size('nQ2P') + calcsize('2nP2n') + 16 + (16*2//3)*calcsize('n2P')) # dictionary-keyview check({}.keys(), size('P')) # dictionary-valueview check({}.values(), size('P')) # dictionary-itemview check({}.items(), size('P')) # dictionary iterator check(iter({}), size('P2nPn')) # dictionary-keyiterator check(iter({}.keys()), size('P2nPn')) # dictionary-valueiterator check(iter({}.values()), size('P2nPn')) # dictionary-itemiterator check(iter({}.items()), size('P2nPn')) # dictproxy class C(object): pass check(C.__dict__, size('P')) # BaseException check(BaseException(), size('5Pb')) # UnicodeEncodeError check(UnicodeEncodeError("", "", 0, 0, ""), size('5Pb 2P2nP')) # UnicodeDecodeError check(UnicodeDecodeError("", b"", 0, 0, ""), size('5Pb 2P2nP')) # UnicodeTranslateError check(UnicodeTranslateError("", 0, 1, ""), size('5Pb 2P2nP')) # ellipses check(Ellipsis, size('')) # EncodingMap import codecs, encodings.iso8859_3 x = codecs.charmap_build(encodings.iso8859_3.decoding_table) check(x, size('32B2iB')) # enumerate check(enumerate([]), size('n3P')) # reverse check(reversed(''), size('nP')) # float check(float(0), size('d')) # sys.floatinfo check(sys.float_info, vsize('') + self.P * len(sys.float_info)) # frame import inspect CO_MAXBLOCKS = 20 x = inspect.currentframe() ncells = len(x.f_code.co_cellvars) nfrees = len(x.f_code.co_freevars) extras = x.f_code.co_stacksize + x.f_code.co_nlocals +\ ncells + nfrees - 1 check(x, vsize('5P2c4P3ic' + CO_MAXBLOCKS*'3i' + 'P' + extras*'P')) # function def func(): pass check(func, size('13P')) class c(): @staticmethod def foo(): pass @classmethod def bar(cls): pass # staticmethod check(foo, size('PP')) # classmethod check(bar, size('PP')) # generator def get_gen(): yield 1 check(get_gen(), size('Pb2PPP4P')) # iterator check(iter('abc'), size('lP')) # callable-iterator import re check(re.finditer('',''), size('2P')) # list samples = [[], [1,2,3], ['1', '2', '3']] for sample in samples: check(list(sample), vsize('Pn') + len(sample)*self.P) # sortwrapper (list) # XXX # cmpwrapper (list) # XXX # listiterator (list) check(iter([]), size('lP')) # listreverseiterator (list) check(reversed([]), size('nP')) # int check(0, vsize('')) check(1, vsize('') + self.longdigit) check(-1, vsize('') + self.longdigit) PyLong_BASE = 2**sys.int_info.bits_per_digit check(int(PyLong_BASE), vsize('') + 2*self.longdigit) check(int(PyLong_BASE**2-1), vsize('') + 2*self.longdigit) check(int(PyLong_BASE**2), vsize('') + 3*self.longdigit) # module check(unittest, size('PnPPP')) # None check(None, size('')) # NotImplementedType check(NotImplemented, size('')) # object check(object(), size('')) # property (descriptor object) class C(object): def getx(self): return self.__x def setx(self, value): self.__x = value def delx(self): del self.__x x = property(getx, setx, delx, "") check(x, size('4Pi')) # PyCapsule # XXX # rangeiterator check(iter(range(1)), size('4l')) # reverse check(reversed(''), size('nP')) # range check(range(1), size('4P')) check(range(66000), size('4P')) # set # frozenset PySet_MINSIZE = 8 samples = [[], range(10), range(50)] s = size('3nP' + PySet_MINSIZE*'nP' + '2nP') for sample in samples: minused = len(sample) if minused == 0: tmp = 1 # the computation of minused is actually a bit more complicated # but this suffices for the sizeof test minused = minused*2 newsize = PySet_MINSIZE while newsize <= minused: newsize = newsize << 1 if newsize <= 8: check(set(sample), s) check(frozenset(sample), s) else: check(set(sample), s + newsize*calcsize('nP')) check(frozenset(sample), s + newsize*calcsize('nP')) # setiterator check(iter(set()), size('P3n')) # slice check(slice(0), size('3P')) # super check(super(int), size('3P')) # tuple check((), vsize('')) check((1,2,3), vsize('') + 3*self.P) # type # static type: PyTypeObject fmt = 'P2nPI13Pl4Pn9Pn11PIPP' s = vsize(fmt) check(int, s) # class s = vsize(fmt + # PyTypeObject '3P' # PyAsyncMethods '36P' # PyNumberMethods '3P' # PyMappingMethods '10P' # PySequenceMethods '2P' # PyBufferProcs '4P') class newstyleclass(object): pass # Separate block for PyDictKeysObject with 8 keys and 5 entries check(newstyleclass, s + calcsize("2nP2n0P") + 8 + 5*calcsize("n2P")) # dict with shared keys check(newstyleclass().__dict__, size('nQ2P') + 5*self.P) o = newstyleclass() o.a = o.b = o.c = o.d = o.e = o.f = o.g = o.h = 1 # Separate block for PyDictKeysObject with 16 keys and 10 entries check(newstyleclass, s + calcsize("2nP2n0P") + 16 + 10*calcsize("n2P")) # dict with shared keys check(newstyleclass().__dict__, size('nQ2P') + 10*self.P) # unicode # each tuple contains a string and its expected character size # don't put any static strings here, as they may contain # wchar_t or UTF-8 representations samples = ['1'*100, '\xff'*50, '\u0100'*40, '\uffff'*100, '\U00010000'*30, '\U0010ffff'*100] asciifields = "nnbP" compactfields = asciifields + "nPn" unicodefields = compactfields + "P" for s in samples: maxchar = ord(max(s)) if maxchar < 128: L = size(asciifields) + len(s) + 1 elif maxchar < 256: L = size(compactfields) + len(s) + 1 elif maxchar < 65536: L = size(compactfields) + 2*(len(s) + 1) else: L = size(compactfields) + 4*(len(s) + 1) check(s, L) # verify that the UTF-8 size is accounted for s = chr(0x4000) # 4 bytes canonical representation check(s, size(compactfields) + 4) # compile() will trigger the generation of the UTF-8 # representation as a side effect compile(s, "", "eval") check(s, size(compactfields) + 4 + 4) # TODO: add check that forces the presence of wchar_t representation # TODO: add check that forces layout of unicodefields # weakref import weakref check(weakref.ref(int), size('2Pn2P')) # weakproxy # XXX # weakcallableproxy check(weakref.proxy(int), size('2Pn2P')) def check_slots(self, obj, base, extra): expected = sys.getsizeof(base) + struct.calcsize(extra) if gc.is_tracked(obj) and not gc.is_tracked(base): expected += self.gc_headsize self.assertEqual(sys.getsizeof(obj), expected) def test_slots(self): # check all subclassable types defined in Objects/ that allow # non-empty __slots__ check = self.check_slots class BA(bytearray): __slots__ = 'a', 'b', 'c' check(BA(), bytearray(), '3P') class D(dict): __slots__ = 'a', 'b', 'c' check(D(x=[]), {'x': []}, '3P') class L(list): __slots__ = 'a', 'b', 'c' check(L(), [], '3P') class S(set): __slots__ = 'a', 'b', 'c' check(S(), set(), '3P') class FS(frozenset): __slots__ = 'a', 'b', 'c' check(FS(), frozenset(), '3P') from collections import OrderedDict class OD(OrderedDict): __slots__ = 'a', 'b', 'c' check(OD(x=[]), OrderedDict(x=[]), '3P') def test_pythontypes(self): # check all types defined in Python/ size = test.support.calcobjsize vsize = test.support.calcvobjsize check = self.check_sizeof # _ast.AST import _ast check(_ast.AST(), size('P')) try: raise TypeError except TypeError: tb = sys.exc_info()[2] # traceback if tb is not None: check(tb, size('2P2i')) # symtable entry # XXX # sys.flags check(sys.flags, vsize('') + self.P * len(sys.flags)) def test_asyncgen_hooks(self): old = sys.get_asyncgen_hooks() self.assertIsNone(old.firstiter) self.assertIsNone(old.finalizer) firstiter = lambda *a: None sys.set_asyncgen_hooks(firstiter=firstiter) hooks = sys.get_asyncgen_hooks() self.assertIs(hooks.firstiter, firstiter) self.assertIs(hooks[0], firstiter) self.assertIs(hooks.finalizer, None) self.assertIs(hooks[1], None) finalizer = lambda *a: None sys.set_asyncgen_hooks(finalizer=finalizer) hooks = sys.get_asyncgen_hooks() self.assertIs(hooks.firstiter, firstiter) self.assertIs(hooks[0], firstiter) self.assertIs(hooks.finalizer, finalizer) self.assertIs(hooks[1], finalizer) sys.set_asyncgen_hooks(*old) cur = sys.get_asyncgen_hooks() self.assertIsNone(cur.firstiter) self.assertIsNone(cur.finalizer) if __name__ == "__main__": unittest.main()