cpython/Lib/test/test_sys.py

531 lines
18 KiB
Python

# -*- coding: iso-8859-1 -*-
import unittest, test.support
import sys, io, os
class SysModuleTest(unittest.TestCase):
def setUp(self):
self.orig_stdout = sys.stdout
self.orig_stderr = sys.stderr
self.orig_displayhook = sys.displayhook
def tearDown(self):
sys.stdout = self.orig_stdout
sys.stderr = self.orig_stderr
sys.displayhook = self.orig_displayhook
def test_original_displayhook(self):
import builtins
out = io.StringIO()
sys.stdout = out
dh = sys.__displayhook__
self.assertRaises(TypeError, dh)
if hasattr(builtins, "_"):
del builtins._
dh(None)
self.assertEqual(out.getvalue(), "")
self.assert_(not hasattr(builtins, "_"))
dh(42)
self.assertEqual(out.getvalue(), "42\n")
self.assertEqual(builtins._, 42)
del sys.stdout
self.assertRaises(RuntimeError, dh, 42)
def test_lost_displayhook(self):
del sys.displayhook
code = compile("42", "<string>", "single")
self.assertRaises(RuntimeError, eval, code)
def test_custom_displayhook(self):
def baddisplayhook(obj):
raise ValueError
sys.displayhook = baddisplayhook
code = compile("42", "<string>", "single")
self.assertRaises(ValueError, eval, code)
def test_original_excepthook(self):
err = io.StringIO()
sys.stderr = err
eh = sys.__excepthook__
self.assertRaises(TypeError, eh)
try:
raise ValueError(42)
except ValueError as exc:
eh(*sys.exc_info())
self.assert_(err.getvalue().endswith("ValueError: 42\n"))
# FIXME: testing the code for a lost or replaced excepthook in
# Python/pythonrun.c::PyErr_PrintEx() is tricky.
def test_exit(self):
self.assertRaises(TypeError, sys.exit, 42, 42)
# call without argument
try:
sys.exit(0)
except SystemExit as exc:
self.assertEquals(exc.code, 0)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with tuple argument with one entry
# entry will be unpacked
try:
sys.exit(42)
except SystemExit as exc:
self.assertEquals(exc.code, 42)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with integer argument
try:
sys.exit((42,))
except SystemExit as exc:
self.assertEquals(exc.code, 42)
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with string argument
try:
sys.exit("exit")
except SystemExit as exc:
self.assertEquals(exc.code, "exit")
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# call with tuple argument with two entries
try:
sys.exit((17, 23))
except SystemExit as exc:
self.assertEquals(exc.code, (17, 23))
except:
self.fail("wrong exception")
else:
self.fail("no exception")
# test that the exit machinery handles SystemExits properly
import subprocess
rc = subprocess.call([sys.executable, "-c",
"raise SystemExit(47)"])
self.assertEqual(rc, 47)
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.assert_(isinstance(sys.getdefaultencoding(), str))
# testing sys.settrace() is done in test_trace.py
# testing sys.setprofile() is done in test_profile.py
def test_setcheckinterval(self):
self.assertRaises(TypeError, sys.setcheckinterval)
orig = sys.getcheckinterval()
for n in 0, 100, 120, orig: # orig last to restore starting state
sys.setcheckinterval(n)
self.assertEquals(sys.getcheckinterval(), n)
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_getwindowsversion(self):
if hasattr(sys, "getwindowsversion"):
v = sys.getwindowsversion()
self.assert_(isinstance(v, tuple))
self.assertEqual(len(v), 5)
self.assert_(isinstance(v[0], int))
self.assert_(isinstance(v[1], int))
self.assert_(isinstance(v[2], int))
self.assert_(isinstance(v[3], int))
self.assert_(isinstance(v[4], str))
def test_dlopenflags(self):
if hasattr(sys, "setdlopenflags"):
self.assert_(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)
def test_refcount(self):
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.assert_(isinstance(sys.gettotalrefcount(), int))
def test_getframe(self):
self.assertRaises(TypeError, sys._getframe, 42, 42)
self.assertRaises(ValueError, sys._getframe, 2000000000)
self.assert_(
SysModuleTest.test_getframe.__code__ \
is sys._getframe().f_code
)
# sys._current_frames() is a CPython-only gimmick.
def test_current_frames(self):
have_threads = True
try:
import _thread
except ImportError:
have_threads = False
if have_threads:
self.current_frames_with_threads()
else:
self.current_frames_without_threads()
# Test sys._current_frames() in a WITH_THREADS build.
def current_frames_with_threads(self):
import threading, _thread
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(_thread.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()
main_id = _thread.get_ident()
self.assert_(main_id in d)
self.assert_(thread_id in d)
# Verify that the captured main-thread frame is _this_ frame.
frame = d.pop(main_id)
self.assert_(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.assert_(sourceline in ["leave_g.wait()", "entered_g.set()"])
# Reap the spawned thread.
leave_g.set()
t.join()
# Test sys._current_frames() when thread support doesn't exist.
def current_frames_without_threads(self):
# Not much happens here: there is only one thread, with artificial
# "thread id" 0.
d = sys._current_frames()
self.assertEqual(len(d), 1)
self.assert_(0 in d)
self.assert_(d[0] is sys._getframe())
def test_attributes(self):
self.assert_(isinstance(sys.api_version, int))
self.assert_(isinstance(sys.argv, list))
self.assert_(sys.byteorder in ("little", "big"))
self.assert_(isinstance(sys.builtin_module_names, tuple))
self.assert_(isinstance(sys.copyright, str))
self.assert_(isinstance(sys.exec_prefix, str))
self.assert_(isinstance(sys.executable, str))
self.assertEqual(len(sys.float_info), 11)
self.assertEqual(sys.float_info.radix, 2)
self.assert_(isinstance(sys.hexversion, int))
self.assert_(isinstance(sys.maxsize, int))
self.assert_(isinstance(sys.maxunicode, int))
self.assert_(isinstance(sys.platform, str))
self.assert_(isinstance(sys.prefix, str))
self.assert_(isinstance(sys.version, str))
vi = sys.version_info
self.assert_(isinstance(vi, tuple))
self.assertEqual(len(vi), 5)
self.assert_(isinstance(vi[0], int))
self.assert_(isinstance(vi[1], int))
self.assert_(isinstance(vi[2], int))
self.assert_(vi[3] in ("alpha", "beta", "candidate", "final"))
self.assert_(isinstance(vi[4], int))
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):
self.assertRaises(TypeError, sys.intern)
s = "never interned before"
self.assert_(sys.intern(s) is s)
s2 = s.swapcase().swapcase()
self.assert_(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 succeeed.
class S(str):
def __hash__(self):
return 123
self.assertRaises(TypeError, sys.intern, S("abc"))
def test_sys_flags(self):
self.failUnless(sys.flags)
attrs = ("debug", "division_warning",
"inspect", "interactive", "optimize", "dont_write_bytecode",
"no_user_site", "no_site", "ignore_environment", "verbose",
"bytes_warning")
for attr in attrs:
self.assert_(hasattr(sys.flags, attr), attr)
self.assertEqual(type(getattr(sys.flags, attr)), int, attr)
self.assert_(repr(sys.flags))
self.assertEqual(len(sys.flags), len(attrs))
def test_clear_type_cache(self):
sys._clear_type_cache()
def test_compact_freelists(self):
sys._compact_freelists()
r = sys._compact_freelists()
## freed blocks shouldn't change
#self.assertEqual(r[0][2], 0)
## fill freelists
#ints = list(range(10000))
#floats = [float(i) for i in ints]
#del ints
#del floats
## should free more than 100 blocks
#r = sys._compact_freelists()
#self.assert_(r[0][1] > 100, r[0][1])
#self.assert_(r[0][2] > 100, r[0][2])
def test_ioencoding(self):
import subprocess,os
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.stdout.read()
self.assertEqual(out, "\xa2\n".encode("cp424"))
env["PYTHONIOENCODING"] = "ascii:replace"
p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'],
stdout = subprocess.PIPE, env=env)
out = p.stdout.read().strip()
self.assertEqual(out, b'?')
class SizeofTest(unittest.TestCase):
def setUp(self):
import struct
self.i = len(struct.pack('i', 0))
self.l = len(struct.pack('l', 0))
self.p = len(struct.pack('P', 0))
self.headersize = self.l + self.p
if hasattr(sys, "gettotalrefcount"):
self.headersize += 2 * self.p
self.file = open(test.support.TESTFN, 'wb')
def tearDown(self):
self.file.close()
test.support.unlink(test.support.TESTFN)
def check_sizeof(self, o, size, size2=None):
"""Check size of o. Possible are size and optionally size2)."""
result = sys.getsizeof(o)
msg = 'wrong size for %s: got %d, expected ' % (type(o), result)
if (size2 != None) and (result != size):
self.assertEqual(result, size2, msg + str(size2))
else:
self.assertEqual(result, size, msg + str(size))
def align(self, value):
mod = value % self.p
if mod != 0:
return value - mod + self.p
else:
return value
def test_align(self):
self.assertEqual(self.align(0) % self.p, 0)
self.assertEqual(self.align(1) % self.p, 0)
self.assertEqual(self.align(3) % self.p, 0)
self.assertEqual(self.align(4) % self.p, 0)
self.assertEqual(self.align(7) % self.p, 0)
self.assertEqual(self.align(8) % self.p, 0)
self.assertEqual(self.align(9) % self.p, 0)
def test_standardtypes(self):
i = self.i
l = self.l
p = self.p
h = self.headersize
# bool
self.check_sizeof(True, h + 2*l)
# bytearray
self.check_sizeof(bytes(), h + self.align(i) + l + p)
# cell
def get_cell():
x = 42
def inner():
return x
return inner
self.check_sizeof(get_cell().__closure__[0], h + p)
# code
self.check_sizeof(get_cell().__code__, h + self.align(5*i) + 8*p +\
self.align(i) + 2*p)
# complex
self.check_sizeof(complex(0,1), h + 2*8)
# enumerate
self.check_sizeof(enumerate([]), h + l + 3*p)
# reverse
self.check_sizeof(reversed(''), h + l + p )
# float
self.check_sizeof(float(0), h + 8)
# function
def func(): pass
self.check_sizeof(func, h + 11 * p)
class c():
@staticmethod
def foo():
pass
@classmethod
def bar(cls):
pass
# staticmethod
self.check_sizeof(foo, h + l)
# classmethod
self.check_sizeof(bar, h + l)
# generator
def get_gen(): yield 1
self.check_sizeof(get_gen(), h + p + self.align(i) + 2*p)
# builtin_function_or_method
self.check_sizeof(abs, h + 3*p)
# module
self.check_sizeof(unittest, h + 3*p)
# range
self.check_sizeof(range(1), h + 3*p)
# slice
self.check_sizeof(slice(0), h + 3*p)
h += l
# new-style class
class class_newstyle(object):
def method():
pass
# type (PyTypeObject + PyNumberMethods + PyMappingMethods +
# PySequenceMethods + PyBufferProcs)
self.check_sizeof(class_newstyle, h +
# PyTypeObject
p + 2*l + 15*p + l + 4*p + l + 9*p + l + 11*p +
self.align(4) +
# PyNumberMethods
16*p + self.align(i) + 17*p +
3*p + # PyMappingMethods
10*p + # PySequenceMethods
2*p + # PyBufferProcs
2*p) # *ht_name and *ht_slots
def test_specialtypes(self):
i = self.i
l = self.l
p = self.p
h = self.headersize
# dict
self.check_sizeof({}, h + 3*l + 3*p + 8*(l + 2*p))
longdict = {1:1, 2:2, 3:3, 4:4, 5:5, 6:6, 7:7, 8:8}
self.check_sizeof(longdict, h + 3*l + 3*p + 8*(l + 2*p) + 16*(l + 2*p))
# list
self.check_sizeof([], h + l + p + l)
self.check_sizeof([1, 2, 3], h + l + p + l + 3*l)
# unicode
import math
usize = math.log(sys.maxunicode + 1, 2) / 8
samples = ['', '1'*100]
# we need to test for both sizes, because we don't know if the string
# has been cached
for s in samples:
basicsize = h + l + p + l + l + p + usize * (len(s) + 1)
defenc = bytes(s, 'ascii')
self.check_sizeof(s, basicsize,
size2=basicsize + sys.getsizeof(defenc))
# trigger caching encoded version as bytes object
try:
getattr(sys, s)
except AttributeError:
pass
finally:
self.check_sizeof(s, basicsize + sys.getsizeof(defenc))
h += l
# long
self.check_sizeof(0, h + self.align(2))
self.check_sizeof(1, h + self.align(2))
self.check_sizeof(-1, h + self.align(2))
self.check_sizeof(32768, h + self.align(2) + 2)
self.check_sizeof(32768*32768-1, h + self.align(2) + 2)
self.check_sizeof(32768*32768, h + self.align(2) + 4)
def test_main():
test.support.run_unittest(SysModuleTest, SizeofTest)
if __name__ == "__main__":
test_main()