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........
  r61098 | jeffrey.yasskin | 2008-02-28 05:45:36 +0100 (Thu, 28 Feb 2008) | 7 lines

  Move abc._Abstract into object by adding a new flag Py_TPFLAGS_IS_ABSTRACT,
  which forbids constructing types that have it set. The effect is to speed

    ./python.exe -m timeit -s 'import abc' -s 'class Foo(object): __metaclass__ = abc.ABCMeta' 'Foo()'

  up from 2.5us to 0.201us. This fixes issue 1762.
........
  r61099 | jeffrey.yasskin | 2008-02-28 06:53:18 +0100 (Thu, 28 Feb 2008) | 3 lines

  Speed test_socketserver up from 28.739s to 0.226s, simplify the logic, and make
  sure all tests run even if some fail.
........
  r61100 | jeffrey.yasskin | 2008-02-28 07:09:19 +0100 (Thu, 28 Feb 2008) | 21 lines

  Thread.start() used sleep(0.000001) to make sure it didn't return before the
  new thread had started. At least on my MacBook Pro, that wound up sleeping for
  a full 10ms (probably 1 jiffy). By using an Event instead, we can be absolutely
  certain that the thread has started, and return more quickly (217us).

  Before:
  $  ./python.exe -m timeit -s 'from threading import Thread'  't = Thread(); t.start(); t.join()'
  100 loops, best of 3: 10.3 msec per loop
  $  ./python.exe -m timeit -s 'from threading import Thread; t = Thread()'  't.isAlive()'
  1000000 loops, best of 3: 0.47 usec per loop

  After:
  $  ./python.exe -m timeit -s 'from threading import Thread'  't = Thread(); t.start(); t.join()'
  1000 loops, best of 3: 217 usec per loop
  $  ./python.exe -m timeit -s 'from threading import Thread; t = Thread()'  't.isAlive()'
  1000000 loops, best of 3: 0.86 usec per loop

  To be fair, the 10ms isn't CPU time, and other threads including the spawned
  one get to run during it. There are also some slightly more complicated ways to
  get back the .4us in isAlive() if we want.
........
  r61101 | raymond.hettinger | 2008-02-28 10:23:48 +0100 (Thu, 28 Feb 2008) | 1 line

  Add repeat keyword argument to itertools.product().
........
  r61102 | christian.heimes | 2008-02-28 12:18:49 +0100 (Thu, 28 Feb 2008) | 1 line

  The empty tuple is usually a singleton with a much higher refcnt than 1
........
This commit is contained in:
Christian Heimes 2008-02-28 12:27:11 +00:00
parent 380f7f22fa
commit 9e7f1d2e96
8 changed files with 246 additions and 174 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
Doc/library/itertools.rst
View file

@ -327,7 +327,7 @@ loops that truncate the stream.
example :func:`islice` or :func:`takewhile`).
.. function:: product(*iterables)
.. function:: product(*iterables[, repeat])
Cartesian product of input iterables.
@ -340,11 +340,15 @@ loops that truncate the stream.
so that if the inputs iterables are sorted, the product tuples are emitted
in sorted order.
To compute the product of an iterable with itself, specify the number of
repetitions with the optional *repeat* keyword argument. For example,
``product(A, repeat=4)`` means the same as ``product(A, A, A, A)``.
Equivalent to the following except that the actual implementation does not
build-up intermediate results in memory::
def product(*args):
pools = map(tuple, args)
def product(*args, **kwds):
pools = map(tuple, args) * kwds.get('repeat', 1)
if pools:
result = [[]]
for pool in pools:

3
Include/object.h
View file

@ -532,6 +532,9 @@ given type object has a specified feature.
#define Py_TPFLAGS_HAVE_VERSION_TAG (1L<<18)
#define Py_TPFLAGS_VALID_VERSION_TAG (1L<<19)
/* Type is abstract and cannot be instantiated */
#define Py_TPFLAGS_IS_ABSTRACT (1L<<20)
/* These flags are used to determine if a type is a subclass. */
#define Py_TPFLAGS_INT_SUBCLASS (1L<<23)
#define Py_TPFLAGS_LONG_SUBCLASS (1L<<24)

47
Lib/abc.py
View file

@ -52,50 +52,6 @@ def setx(self, value): ...
__isabstractmethod__ = True
class _Abstract(object):
"""Helper class inserted into the bases by ABCMeta (using _fix_bases()).
You should never need to explicitly subclass this class.
"""
def __new__(cls, *args, **kwds):
am = cls.__dict__.get("__abstractmethods__")
if am:
raise TypeError("Can't instantiate abstract class %s "
"with abstract methods %s" %
(cls.__name__, ", ".join(sorted(am))))
if (args or kwds) and cls.__init__ is object.__init__:
raise TypeError("Can't pass arguments to __new__ "
"without overriding __init__")
return super().__new__(cls)
@classmethod
def __subclasshook__(cls, subclass):
"""Abstract classes can override this to customize issubclass().
This is invoked early on by __subclasscheck__() below. It
should return True, False or NotImplemented. If it returns
NotImplemented, the normal algorithm is used. Otherwise, it
overrides the normal algorithm (and the outcome is cached).
"""
return NotImplemented
def _fix_bases(bases):
"""Helper method that inserts _Abstract in the bases if needed."""
for base in bases:
if issubclass(base, _Abstract):
# _Abstract is already a base (maybe indirectly)
return bases
if object in bases:
# Replace object with _Abstract
return tuple([_Abstract if base is object else base
for base in bases])
# Append _Abstract to the end
return bases + (_Abstract,)
class ABCMeta(type):
"""Metaclass for defining Abstract Base Classes (ABCs).
@ -118,7 +74,6 @@ class ABCMeta(type):
_abc_invalidation_counter = 0
def __new__(mcls, name, bases, namespace):
bases = _fix_bases(bases)
cls = super().__new__(mcls, name, bases, namespace)
# Compute set of abstract method names
abstracts = {name
@ -129,7 +84,7 @@ def __new__(mcls, name, bases, namespace):
value = getattr(cls, name, None)
if getattr(value, "__isabstractmethod__", False):
abstracts.add(name)
cls.__abstractmethods__ = abstracts
cls.__abstractmethods__ = frozenset(abstracts)
# Set up inheritance registry
cls._abc_registry = WeakSet()
cls._abc_cache = WeakSet()

9
Lib/decimal.py
View file

@ -1649,6 +1649,9 @@ def _round_down(self, prec):
else:
return -1
def __round__(self):
return self._round_down(0)
def _round_up(self, prec):
"""Rounds away from 0."""
return -self._round_down(prec)
@ -1684,6 +1687,9 @@ def _round_ceiling(self, prec):
else:
return -self._round_down(prec)
def __ceil__(self):
return self._round_ceiling(0)
def _round_floor(self, prec):
"""Rounds down (not towards 0 if negative)"""
if not self._sign:
@ -1691,6 +1697,9 @@ def _round_floor(self, prec):
else:
return -self._round_down(prec)
def __floor__(self):
return self._round_floor(0)
def _round_05up(self, prec):
"""Round down unless digit prec-1 is 0 or 5."""
if prec and self._int[prec-1] not in '05':

1
Lib/test/test_descrtut.py
View file

@ -196,6 +196,7 @@ def merge(self, other):
'__setattr__',
'__setitem__',
'__str__',
'__subclasshook__',
'append',
'count',
'extend',

213
Lib/test/test_socketserver.py
View file

@ -2,13 +2,15 @@
Test suite for SocketServer.py.
"""
import os
import socket
import errno
import imp
import os
import select
import time
import signal
import socket
import tempfile
import threading
import time
import unittest
import SocketServer
@ -19,7 +21,6 @@
test.test_support.requires("network")
NREQ = 3
DELAY = 0.5
TEST_STR = b"hello world\n"
HOST = "localhost"
@ -27,14 +28,6 @@
HAVE_FORKING = hasattr(os, "fork") and os.name != "os2"
class MyMixinHandler:
def handle(self):
time.sleep(DELAY)
line = self.rfile.readline()
time.sleep(DELAY)
self.wfile.write(line)
def receive(sock, n, timeout=20):
r, w, x = select.select([sock], [], [], timeout)
if sock in r:
@ -42,14 +35,6 @@ def receive(sock, n, timeout=20):
else:
raise RuntimeError("timed out on %r" % (sock,))
class MyStreamHandler(MyMixinHandler, SocketServer.StreamRequestHandler):
pass
class MyDatagramHandler(MyMixinHandler,
SocketServer.DatagramRequestHandler):
pass
if HAVE_UNIX_SOCKETS:
class ForkingUnixStreamServer(SocketServer.ForkingMixIn,
SocketServer.UnixStreamServer):
@ -111,47 +96,28 @@ class svrcls(MyMixinServer, self.__svrcls):
pass
if verbose: print("thread: creating server")
svr = svrcls(self.__addr, self.__hdlrcls)
# pull the address out of the server in case it changed
# this can happen if another process is using the port
addr = svr.server_address
if addr:
self.__addr = addr
if self.__addr != svr.socket.getsockname():
raise RuntimeError('server_address was %s, expected %s' %
(self.__addr, svr.socket.getsockname()))
# We had the OS pick a port, so pull the real address out of
# the server.
self.addr = svr.server_address
self.port = self.addr[1]
if self.addr != svr.socket.getsockname():
raise RuntimeError('server_address was %s, expected %s' %
(self.addr, svr.socket.getsockname()))
self.ready.set()
if verbose: print("thread: serving three times")
svr.serve_a_few()
if verbose: print("thread: done")
class ForgivingTCPServer(SocketServer.TCPServer):
# prevent errors if another process is using the port we want
def server_bind(self):
host, default_port = self.server_address
# this code shamelessly stolen from test.test_support
# the ports were changed to protect the innocent
import sys
for port in [default_port, 3434, 8798, 23833]:
try:
self.server_address = host, port
SocketServer.TCPServer.server_bind(self)
break
except socket.error as e:
(err, msg) = e
if err != errno.EADDRINUSE:
raise
print(' WARNING: failed to listen on port %d, trying another' % port, file=sys.__stderr__)
class SocketServerTest(unittest.TestCase):
"""Test all socket servers."""
def setUp(self):
signal.alarm(20) # Kill deadlocks after 20 seconds.
self.port_seed = 0
self.test_files = []
def tearDown(self):
time.sleep(DELAY)
reap_children()
for fn in self.test_files:
@ -160,16 +126,18 @@ def tearDown(self):
except os.error:
pass
self.test_files[:] = []
def pickport(self):
self.port_seed += 1
return 10000 + (os.getpid() % 1000)*10 + self.port_seed
signal.alarm(0) # Didn't deadlock.
def pickaddr(self, proto):
if proto == socket.AF_INET:
return (HOST, self.pickport())
return (HOST, 0)
else:
fn = TEST_FILE + str(self.pickport())
# XXX: We need a way to tell AF_UNIX to pick its own name
# like AF_INET provides port==0.
dir = None
if os.name == 'os2':
dir = '\socket'
fn = tempfile.mktemp(prefix='unix_socket.', dir=dir)
if os.name == 'os2':
# AF_UNIX socket names on OS/2 require a specific prefix
# which can't include a drive letter and must also use
@ -178,7 +146,6 @@ def pickaddr(self, proto):
fn = fn[2:]
if fn[0] in (os.sep, os.altsep):
fn = fn[1:]
fn = os.path.join('\socket', fn)
if os.sep == '/':
fn = fn.replace(os.sep, os.altsep)
else:
@ -186,25 +153,31 @@ def pickaddr(self, proto):
self.test_files.append(fn)
return fn
def run_servers(self, proto, servers, hdlrcls, testfunc):
for svrcls in servers:
addr = self.pickaddr(proto)
if verbose:
print("ADDR =", addr)
print("CLASS =", svrcls)
t = ServerThread(addr, svrcls, hdlrcls)
if verbose: print("server created")
t.start()
if verbose: print("server running")
for i in range(NREQ):
t.ready.wait(10*DELAY)
self.assert_(t.ready.isSet(),
"Server not ready within a reasonable time")
if verbose: print("test client", i)
testfunc(proto, addr)
if verbose: print("waiting for server")
t.join()
if verbose: print("done")
def run_server(self, svrcls, hdlrbase, testfunc):
class MyHandler(hdlrbase):
def handle(self):
line = self.rfile.readline()
self.wfile.write(line)
addr = self.pickaddr(svrcls.address_family)
if verbose:
print("ADDR =", addr)
print("CLASS =", svrcls)
t = ServerThread(addr, svrcls, MyHandler)
if verbose: print("server created")
t.start()
if verbose: print("server running")
t.ready.wait(10)
self.assert_(t.ready.isSet(),
"%s not ready within a reasonable time" % svrcls)
addr = t.addr
for i in range(NREQ):
if verbose: print("test client", i)
testfunc(svrcls.address_family, addr)
if verbose: print("waiting for server")
t.join()
if verbose: print("done")
def stream_examine(self, proto, addr):
s = socket.socket(proto, socket.SOCK_STREAM)
@ -227,47 +200,74 @@ def dgram_examine(self, proto, addr):
self.assertEquals(buf, TEST_STR)
s.close()
def test_TCPServers(self):
# Test SocketServer.TCPServer
servers = [ForgivingTCPServer, SocketServer.ThreadingTCPServer]
if HAVE_FORKING:
servers.append(SocketServer.ForkingTCPServer)
self.run_servers(socket.AF_INET, servers,
MyStreamHandler, self.stream_examine)
def test_TCPServer(self):
self.run_server(SocketServer.TCPServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
def test_UDPServers(self):
# Test SocketServer.UDPServer
servers = [SocketServer.UDPServer,
SocketServer.ThreadingUDPServer]
if HAVE_FORKING:
servers.append(SocketServer.ForkingUDPServer)
self.run_servers(socket.AF_INET, servers, MyDatagramHandler,
self.dgram_examine)
def test_ThreadingTCPServer(self):
self.run_server(SocketServer.ThreadingTCPServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
if HAVE_FORKING:
def test_ThreadingTCPServer(self):
self.run_server(SocketServer.ForkingTCPServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
if HAVE_UNIX_SOCKETS:
def test_UnixStreamServer(self):
self.run_server(SocketServer.UnixStreamServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
def test_ThreadingUnixStreamServer(self):
self.run_server(SocketServer.ThreadingUnixStreamServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
def test_stream_servers(self):
# Test SocketServer's stream servers
if not HAVE_UNIX_SOCKETS:
return
servers = [SocketServer.UnixStreamServer,
SocketServer.ThreadingUnixStreamServer]
if HAVE_FORKING:
servers.append(ForkingUnixStreamServer)
self.run_servers(socket.AF_UNIX, servers, MyStreamHandler,
self.stream_examine)
def test_ForkingUnixStreamServer(self):
self.run_server(ForkingUnixStreamServer,
SocketServer.StreamRequestHandler,
self.stream_examine)
def test_UDPServer(self):
self.run_server(SocketServer.UDPServer,
SocketServer.DatagramRequestHandler,
self.dgram_examine)
def test_ThreadingUDPServer(self):
self.run_server(SocketServer.ThreadingUDPServer,
SocketServer.DatagramRequestHandler,
self.dgram_examine)
if HAVE_FORKING:
def test_ForkingUDPServer(self):
self.run_server(SocketServer.ForkingUDPServer,
SocketServer.DatagramRequestHandler,
self.dgram_examine)
# Alas, on Linux (at least) recvfrom() doesn't return a meaningful
# client address so this cannot work:
# def test_dgram_servers(self):
# # Test SocketServer.UnixDatagramServer
# if not HAVE_UNIX_SOCKETS:
# return
# servers = [SocketServer.UnixDatagramServer,
# SocketServer.ThreadingUnixDatagramServer]
# if HAVE_UNIX_SOCKETS:
# def test_UnixDatagramServer(self):
# self.run_server(SocketServer.UnixDatagramServer,
# SocketServer.DatagramRequestHandler,
# self.dgram_examine)
#
# def test_ThreadingUnixDatagramServer(self):
# self.run_server(SocketServer.ThreadingUnixDatagramServer,
# SocketServer.DatagramRequestHandler,
# self.dgram_examine)
#
# if HAVE_FORKING:
# servers.append(ForkingUnixDatagramServer)
# self.run_servers(socket.AF_UNIX, servers, MyDatagramHandler,
# self.dgram_examine)
# def test_ForkingUnixDatagramServer(self):
# self.run_server(SocketServer.ForkingUnixDatagramServer,
# SocketServer.DatagramRequestHandler,
# self.dgram_examine)
def test_main():
@ -279,3 +279,4 @@ def test_main():
if __name__ == "__main__":
test_main()
signal.alarm(3) # Shutdown shouldn't take more than 3 seconds.

39
Lib/threading.py
View file

@ -403,7 +403,7 @@ def __init__(self, group=None, target=None, name=None,
self._args = args
self._kwargs = kwargs
self._daemonic = self._set_daemon()
self._started = False
self._started = Event()
self._stopped = False
self._block = Condition(Lock())
self._initialized = True
@ -418,7 +418,7 @@ def _set_daemon(self):
def __repr__(self):
assert self._initialized, "Thread.__init__() was not called"
status = "initial"
if self._started:
if self._started.isSet():
status = "started"
if self._stopped:
status = "stopped"
@ -429,7 +429,8 @@ def __repr__(self):
def start(self):
if not self._initialized:
raise RuntimeError("thread.__init__() not called")
if self._started:
if self._started.isSet():
raise RuntimeError("thread already started")
if __debug__:
self._note("%s.start(): starting thread", self)
@ -437,8 +438,7 @@ def start(self):
_limbo[self] = self
_active_limbo_lock.release()
_start_new_thread(self._bootstrap, ())
self._started = True
_sleep(0.000001) # 1 usec, to let the thread run (Solaris hack)
self._started.wait()
def run(self):
try:
@ -455,11 +455,11 @@ def _bootstrap(self):
# happen when a daemon thread wakes up at an unfortunate
# moment, finds the world around it destroyed, and raises some
# random exception *** while trying to report the exception in
# __bootstrap_inner() below ***. Those random exceptions
# _bootstrap_inner() below ***. Those random exceptions
# don't help anybody, and they confuse users, so we suppress
# them. We suppress them only when it appears that the world
# indeed has already been destroyed, so that exceptions in
# __bootstrap_inner() during normal business hours are properly
# _bootstrap_inner() during normal business hours are properly
# reported. Also, we only suppress them for daemonic threads;
# if a non-daemonic encounters this, something else is wrong.
try:
@ -471,29 +471,29 @@ def _bootstrap(self):
def _bootstrap_inner(self):
try:
self._started = True
self._started.set()
_active_limbo_lock.acquire()
_active[_get_ident()] = self
del _limbo[self]
_active_limbo_lock.release()
if __debug__:
self._note("%s.__bootstrap(): thread started", self)
self._note("%s._bootstrap(): thread started", self)
if _trace_hook:
self._note("%s.__bootstrap(): registering trace hook", self)
self._note("%s._bootstrap(): registering trace hook", self)
_sys.settrace(_trace_hook)
if _profile_hook:
self._note("%s.__bootstrap(): registering profile hook", self)
self._note("%s._bootstrap(): registering profile hook", self)
_sys.setprofile(_profile_hook)
try:
self.run()
except SystemExit:
if __debug__:
self._note("%s.__bootstrap(): raised SystemExit", self)
self._note("%s._bootstrap(): raised SystemExit", self)
except:
if __debug__:
self._note("%s.__bootstrap(): unhandled exception", self)
self._note("%s._bootstrap(): unhandled exception", self)
# If sys.stderr is no more (most likely from interpreter
# shutdown) use self._stderr. Otherwise still use sys (as in
# _sys) in case sys.stderr was redefined since the creation of
@ -526,7 +526,7 @@ def _bootstrap_inner(self):
del exc_type, exc_value, exc_tb
else:
if __debug__:
self._note("%s.__bootstrap(): normal return", self)
self._note("%s._bootstrap(): normal return", self)
finally:
with _active_limbo_lock:
self._stop()
@ -580,7 +580,7 @@ def _delete(self):
def join(self, timeout=None):
if not self._initialized:
raise RuntimeError("Thread.__init__() not called")
if not self._started:
if not self._started.isSet():
raise RuntimeError("cannot join thread before it is started")
if self is currentThread():
raise RuntimeError("cannot join current thread")
@ -621,7 +621,7 @@ def setName(self, name):
def isAlive(self):
assert self._initialized, "Thread.__init__() not called"
return self._started and not self._stopped
return self._started.isSet() and not self._stopped
def isDaemon(self):
assert self._initialized, "Thread.__init__() not called"
@ -630,7 +630,7 @@ def isDaemon(self):
def setDaemon(self, daemonic):
if not self._initialized:
raise RuntimeError("Thread.__init__() not called")
if self._started:
if self._started.isSet():
raise RuntimeError("cannot set daemon status of active thread");
self._daemonic = daemonic
@ -672,7 +672,7 @@ class _MainThread(Thread):
def __init__(self):
Thread.__init__(self, name="MainThread")
self._started = True
self._started.set()
_active_limbo_lock.acquire()
_active[_get_ident()] = self
_active_limbo_lock.release()
@ -718,7 +718,8 @@ def __init__(self):
# instance is immortal, that's bad, so release this resource.
del self._block
self._started = True
self._started.set()
_active_limbo_lock.acquire()
_active[_get_ident()] = self
_active_limbo_lock.release()

98
Objects/typeobject.c
View file

@ -318,6 +318,40 @@ type_set_module(PyTypeObject *type, PyObject *value, void *context)
return PyDict_SetItemString(type->tp_dict, "__module__", value);
}
static PyObject *
type_abstractmethods(PyTypeObject *type, void *context)
{
PyObject *mod = PyDict_GetItemString(type->tp_dict,
"__abstractmethods__");
if (!mod) {
PyErr_Format(PyExc_AttributeError, "__abstractmethods__");
return NULL;
}
Py_XINCREF(mod);
return mod;
}
static int
type_set_abstractmethods(PyTypeObject *type, PyObject *value, void *context)
{
/* __abstractmethods__ should only be set once on a type, in
abc.ABCMeta.__new__, so this function doesn't do anything
special to update subclasses.
*/
int res = PyDict_SetItemString(type->tp_dict,
"__abstractmethods__", value);
if (res == 0) {
type_modified(type);
if (value && PyObject_IsTrue(value)) {
type->tp_flags |= Py_TPFLAGS_IS_ABSTRACT;
}
else {
type->tp_flags &= ~Py_TPFLAGS_IS_ABSTRACT;
}
}
return res;
}
static PyObject *
type_get_bases(PyTypeObject *type, void *context)
{
@ -555,6 +589,8 @@ static PyGetSetDef type_getsets[] = {
{"__name__", (getter)type_name, (setter)type_set_name, NULL},
{"__bases__", (getter)type_get_bases, (setter)type_set_bases, NULL},
{"__module__", (getter)type_module, (setter)type_set_module, NULL},
{"__abstractmethods__", (getter)type_abstractmethods,
(setter)type_set_abstractmethods, NULL},
{"__dict__", (getter)type_dict, NULL, NULL},
{"__doc__", (getter)type_get_doc, NULL, NULL},
{0}
@ -2638,6 +2674,52 @@ object_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
}
if (err < 0)
return NULL;
if (type->tp_flags & Py_TPFLAGS_IS_ABSTRACT) {
static PyObject *comma = NULL;
PyObject *abstract_methods = NULL;
PyObject *builtins;
PyObject *sorted;
PyObject *sorted_methods = NULL;
PyObject *joined = NULL;
/* Compute ", ".join(sorted(type.__abstractmethods__))
into joined. */
abstract_methods = type_abstractmethods(type, NULL);
if (abstract_methods == NULL)
goto error;
builtins = PyEval_GetBuiltins();
if (builtins == NULL)
goto error;
sorted = PyDict_GetItemString(builtins, "sorted");
if (sorted == NULL)
goto error;
sorted_methods = PyObject_CallFunctionObjArgs(sorted,
abstract_methods,
NULL);
if (sorted_methods == NULL)
goto error;
if (comma == NULL) {
comma = PyUnicode_InternFromString(", ");
if (comma == NULL)
goto error;
}
joined = PyObject_CallMethod(comma, "join",
"O", sorted_methods);
if (joined == NULL)
goto error;
PyErr_Format(PyExc_TypeError,
"Can't instantiate abstract class %s "
"with abstract methods %U",
type->tp_name,
joined);
error:
Py_XDECREF(joined);
Py_XDECREF(sorted_methods);
Py_XDECREF(abstract_methods);
return NULL;
}
return type->tp_alloc(type, 0);
}
@ -3143,6 +3225,20 @@ object_reduce_ex(PyObject *self, PyObject *args)
return _common_reduce(self, proto);
}
static PyObject *
object_subclasshook(PyObject *cls, PyObject *args)
{
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
PyDoc_STRVAR(object_subclasshook_doc,
"Abstract classes can override this to customize issubclass().\n"
"\n"
"This is invoked early on by abc.ABCMeta.__subclasscheck__().\n"
"It should return True, False or NotImplemented. If it returns\n"
"NotImplemented, the normal algorithm is used. Otherwise, it\n"
"overrides the normal algorithm (and the outcome is cached).\n");
/*
from PEP 3101, this code implements:
@ -3183,6 +3279,8 @@ static PyMethodDef object_methods[] = {
PyDoc_STR("helper for pickle")},
{"__reduce__", object_reduce, METH_VARARGS,
PyDoc_STR("helper for pickle")},
{"__subclasshook__", object_subclasshook, METH_CLASS | METH_VARARGS,
object_subclasshook_doc},
{"__format__", object_format, METH_VARARGS,
PyDoc_STR("default object formatter")},
{0}