Mailman 3 April 2014 - Python-Dev

New absolute __file__ in Python 3.4
by anatoly techtonik April 4, 2014

April 4, 2014

https://docs.python.org/3.4/whatsnew/3.4.html#other-language-changes 1. Is this absolute name with symlinks resolved? 2. Why there is a special case for __main__? (i.e. Special cases aren't special enough to break the rules.) 3. What link should I click in Python reference to read about standard globals like __file__ and this change? https://docs.python.org/3.4/library/index.html something like this in PHP http://www.php.net/manual/en/language.constants.predefined.php -- anatoly t.

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Summary of Python tracker Issues
by Python tracker April 4, 2014

April 4, 2014

ACTIVITY SUMMARY (2014-03-28 - 2014-04-04) Python tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 4550 (+16) closed 28376 (+52) total 32926 (+68) Open issues with patches: 2093 Issues opened (48) ================== #21087: imp.frozen_init() incorrectly removes module during reload http://bugs.python.org/issue21087 opened by eric.snow #21088: curses addch(… [View More]

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Re: [Python-Dev] [Python-checkins] cpython: fix #21076: turn signal module constants into enums
by Brett Cannon April 4, 2014

April 4, 2014

This broke compilation on at least OS X, but I'm willing to bet for all UNIX-based systems. I have a fix in the works. On Fri, Apr 4, 2014 at 9:34 AM, giampaolo.rodola <python-checkins(a)python.org > wrote: > http://hg.python.org/cpython/rev/c9239171e429 > changeset: 90128:c9239171e429 > user: Giampaolo Rodola' <g.rodola(a)gmail.com> > date: Fri Apr 04 15:34:17 2014 +0200 > summary: > fix #21076: turn signal module constants into enums > … [View More]> files: > Doc/library/signal.rst | 10 +++ > Doc/whatsnew/3.5.rst | 5 + > Lib/signal.py | 84 ++++++++++++++++++++++++++++ > Lib/test/test_doctest.py | 2 +- > Lib/test/test_signal.py | 39 +++++++++++- > Modules/signalmodule.c | 4 +- > PC/config.c | 2 +- > 7 files changed, 138 insertions(+), 8 deletions(-) > > > diff --git a/Doc/library/signal.rst b/Doc/library/signal.rst > --- a/Doc/library/signal.rst > +++ b/Doc/library/signal.rst > @@ -65,6 +65,16 @@ > Module contents > --------------- > > +.. versionchanged:: 3.5 > + signal (SIG*), handler (:const:`SIG_DFL`, :const:`SIG_IGN`) and sigmask > + (:const:`SIG_BLOCK`, :const:`SIG_UNBLOCK`, :const:`SIG_SETMASK`) > + related constants listed below were turned into > + :class:`enums <enum.IntEnum>`. > + :func:`getsignal`, :func:`pthread_sigmask`, :func:`sigpending` and > + :func:`sigwait` functions return human-readable > + :class:`enums <enum.IntEnum>`. > + > + > The variables defined in the :mod:`signal` module are: > > > diff --git a/Doc/whatsnew/3.5.rst b/Doc/whatsnew/3.5.rst > --- a/Doc/whatsnew/3.5.rst > +++ b/Doc/whatsnew/3.5.rst > @@ -134,6 +134,11 @@ > Improved Modules > ================ > > +* Different constants of :mod:`signal` module are now enumeration values > using > + the :mod:`enum` module. This allows meaningful names to be printed > during > + debugging, instead of integer “magic numbers”. (contribute by Giampaolo > + Rodola' in :issue:`21076`) > + > * :class:`xmlrpc.client.ServerProxy` is now a :term:`context manager` > (contributed by Claudiu Popa in :issue:`20627`). > > diff --git a/Lib/signal.py b/Lib/signal.py > new file mode 100644 > --- /dev/null > +++ b/Lib/signal.py > @@ -0,0 +1,84 @@ > +import _signal > +from _signal import * > +from functools import wraps as _wraps > +from enum import IntEnum as _IntEnum > + > +_globals = globals() > + > +Signals = _IntEnum( > + 'Signals', > + {name: value for name, value in _globals.items() > + if name.isupper() > + and (name.startswith('SIG') and not name.startswith('SIG_')) > + or name.startswith('CTRL_')}) > + > +class Handlers(_IntEnum): > + SIG_DFL = _signal.SIG_DFL > + SIG_IGN = _signal.SIG_IGN > + > +_globals.update(Signals.__members__) > +_globals.update(Handlers.__members__) > + > +if 'pthread_sigmask' in _globals: > + class Sigmasks(_IntEnum): > + SIG_BLOCK = _signal.SIG_BLOCK > + SIG_UNBLOCK = _signal.SIG_UNBLOCK > + SIG_SETMASK = _signal.SIG_SETMASK > + > + _globals.update(Sigmasks.__members__) > + > + > +def _int_to_enum(value, enum_klass): > + """Convert a numeric value to an IntEnum member. > + If it's not a known member, return the numeric value itself. > + """ > + try: > + return enum_klass(value) > + except ValueError: > + return value > + > + > +def _enum_to_int(value): > + """Convert an IntEnum member to a numeric value. > + If it's not a IntEnum member return the value itself. > + """ > + try: > + return int(value) > + except (ValueError, TypeError): > + return value > + > + > +(a)_wraps(_signal.signal) > +def signal(signalnum, handler): > + handler = _signal.signal(_enum_to_int(signalnum), > _enum_to_int(handler)) > + return _int_to_enum(handler, Handlers) > + > + > +(a)_wraps(_signal.getsignal) > +def getsignal(signalnum): > + handler = _signal.getsignal(signalnum) > + return _int_to_enum(handler, Handlers) > + > + > +if 'pthread_sigmask' in _globals: > + @_wraps(_signal.pthread_sigmask) > + def pthread_sigmask(how, mask): > + sigs_set = _signal.pthread_sigmask(how, mask) > + return set(_int_to_enum(x, Signals) for x in sigs_set) > + pthread_sigmask.__doc__ = _signal.pthread_sigmask.__doc__ > + > + > +(a)_wraps(_signal.sigpending) > +def sigpending(): > + sigs = _signal.sigpending() > + return set(_int_to_enum(x, Signals) for x in sigs) > + > + > +if 'sigwait' in _globals: > + @_wraps(_signal.sigwait) > + def sigwait(sigset): > + retsig = _signal.sigwait(sigset) > + return _int_to_enum(retsig, Signals) > + sigwait.__doc__ = _signal.sigwait > + > +del _globals, _wraps > diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py > --- a/Lib/test/test_doctest.py > +++ b/Lib/test/test_doctest.py > @@ -2897,7 +2897,7 @@ > > def test_main(): > # Check the doctest cases in doctest itself: > - support.run_doctest(doctest, verbosity=True) > + ret = support.run_doctest(doctest, verbosity=True) > # Check the doctest cases defined here: > from test import test_doctest > support.run_doctest(test_doctest, verbosity=True) > diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py > --- a/Lib/test/test_signal.py > +++ b/Lib/test/test_signal.py > @@ -1,6 +1,7 @@ > import unittest > from test import support > from contextlib import closing > +import enum > import gc > import pickle > import select > @@ -39,6 +40,22 @@ > return None > > > +class GenericTests(unittest.TestCase): > + > + def test_enums(self): > + for name in dir(signal): > + sig = getattr(signal, name) > + if name in {'SIG_DFL', 'SIG_IGN'}: > + self.assertIsInstance(sig, signal.Handlers) > + elif name in {'SIG_BLOCK', 'SIG_UNBLOCK', 'SIG_SETMASK'}: > + self.assertIsInstance(sig, signal.Sigmasks) > + elif name.startswith('SIG') and not name.startswith('SIG_'): > + self.assertIsInstance(sig, signal.Signals) > + elif name.startswith('CTRL_'): > + self.assertIsInstance(sig, signal.Signals) > + self.assertEqual(sys.platform, "win32") > + > + > @unittest.skipIf(sys.platform == "win32", "Not valid on Windows") > class InterProcessSignalTests(unittest.TestCase): > MAX_DURATION = 20 # Entire test should last at most 20 sec. > @@ -195,6 +212,7 @@ > > def test_getsignal(self): > hup = signal.signal(signal.SIGHUP, self.trivial_signal_handler) > + self.assertIsInstance(hup, signal.Handlers) > self.assertEqual(signal.getsignal(signal.SIGHUP), > self.trivial_signal_handler) > signal.signal(signal.SIGHUP, hup) > @@ -271,7 +289,7 @@ > > os.close(read) > os.close(write) > - """.format(signals, ordered, test_body) > + """.format(tuple(map(int, signals)), ordered, test_body) > > assert_python_ok('-c', code) > > @@ -604,6 +622,8 @@ > signal.pthread_sigmask(signal.SIG_BLOCK, [signum]) > os.kill(os.getpid(), signum) > pending = signal.sigpending() > + for sig in pending: > + assert isinstance(sig, signal.Signals), repr(pending) > if pending != {signum}: > raise Exception('%s != {%s}' % (pending, signum)) > try: > @@ -660,6 +680,7 @@ > code = '''if 1: > import signal > import sys > + from signal import Signals > > def handler(signum, frame): > 1/0 > @@ -702,6 +723,7 @@ > def test(signum): > signal.alarm(1) > received = signal.sigwait([signum]) > + assert isinstance(received, signal.Signals), received > if received != signum: > raise Exception('received %s, not %s' % (received, > signum)) > ''') > @@ -842,8 +864,14 @@ > def kill(signum): > os.kill(os.getpid(), signum) > > + def check_mask(mask): > + for sig in mask: > + assert isinstance(sig, signal.Signals), repr(sig) > + > def read_sigmask(): > - return signal.pthread_sigmask(signal.SIG_BLOCK, []) > + sigmask = signal.pthread_sigmask(signal.SIG_BLOCK, []) > + check_mask(sigmask) > + return sigmask > > signum = signal.SIGUSR1 > > @@ -852,6 +880,7 @@ > > # Unblock SIGUSR1 (and copy the old mask) to test our signal > handler > old_mask = signal.pthread_sigmask(signal.SIG_UNBLOCK, [signum]) > + check_mask(old_mask) > try: > kill(signum) > except ZeroDivisionError: > @@ -861,11 +890,13 @@ > > # Block and then raise SIGUSR1. The signal is blocked: the signal > # handler is not called, and the signal is now pending > - signal.pthread_sigmask(signal.SIG_BLOCK, [signum]) > + mask = signal.pthread_sigmask(signal.SIG_BLOCK, [signum]) > + check_mask(mask) > kill(signum) > > # Check the new mask > blocked = read_sigmask() > + check_mask(blocked) > if signum not in blocked: > raise Exception("%s not in %s" % (signum, blocked)) > if old_mask ^ blocked != {signum}: > @@ -928,7 +959,7 @@ > > def test_main(): > try: > - support.run_unittest(PosixTests, InterProcessSignalTests, > + support.run_unittest(GenericTests, PosixTests, > InterProcessSignalTests, > WakeupFDTests, WakeupSignalTests, > SiginterruptTest, ItimerTest, > WindowsSignalTests, > PendingSignalsTests) > diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c > --- a/Modules/signalmodule.c > +++ b/Modules/signalmodule.c > @@ -967,7 +967,7 @@ > }; > > PyMODINIT_FUNC > -PyInit_signal(void) > +PyInit__signal(void) > { > PyObject *m, *d, *x; > int i; > @@ -1380,7 +1380,7 @@ > void > PyOS_InitInterrupts(void) > { > - PyObject *m = PyImport_ImportModule("signal"); > + PyObject *m = PyImport_ImportModule("_signal"); > if (m) { > Py_DECREF(m); > } > diff --git a/PC/config.c b/PC/config.c > --- a/PC/config.c > +++ b/PC/config.c > @@ -19,7 +19,7 @@ > extern PyObject* PyInit__md5(void); > extern PyObject* PyInit_nt(void); > extern PyObject* PyInit__operator(void); > -extern PyObject* PyInit_signal(void); > +extern PyObject* PyInit__signal(void); > extern PyObject* PyInit__sha1(void); > extern PyObject* PyInit__sha256(void); > extern PyObject* PyInit__sha512(void); > > -- > Repository URL: http://hg.python.org/cpython > > _______________________________________________ > Python-checkins mailing list > Python-checkins(a)python.org > https://mail.python.org/mailman/listinfo/python-checkins > > [View Less]

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Python 4?
by Skip Montanaro April 3, 2014

April 3, 2014

I saw mention recently of Python 4 and assumed all such references were either April Fool's jokes or pie-in-the-sky dreams for a new version of Python which may never arrive. Then I saw this message to webmaster. I would have guessed he meant 3.4 except he mentions having a Python3 (well, actually, a Phython3) directory. WTH is Python 4? Skip ---------- Forwarded message ---------- From: C. Reese <careese(a)vcu.org> Date: Thu, Apr 3, 2014 at 8:03 AM Subject: Updated phython To: … [View More]

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Gmane not functioning.
by Terry Reedy April 3, 2014

April 3, 2014

Just to let those who read the list as a list (or via mail.python.org, as I just did as a backup) know, news.gmane.org appears to have stoppedreceiving new messages from mailing listsat about 0:30 this morning (apr 2). (I am judging this from the last recorded post on the super-busy linux kernallist http://news.gmane.org/gmane.linux.kernel/cutoff=1676398). So there will be some unknown number of people not reading and posting who might otherwise. Ditto for other lists. -- Terry Jan Reedy

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Incorrect behavior in str.format() method when padding with '\x00'
by John Tyree April 3, 2014

April 3, 2014

Hi all, Is there any particularly reason for the following behavior on both 2.7.6 and 3.4.0 ? >>> "{:\x00<5}".format(2) > '2 ' > >>> > "{:\x20<5}".format(2) > > '2 ' > >>> > "{:\x01<5}".format(2) > > '2\x01\x01\x01\x01' > >>> "{:\x00<5}".format(2) == > "{:\x20<5}".format(2) > > True > The docs say "If a valid *align* value is specified, it can be preceded by a *fill* character that can be any … [View More]

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libpython added to ABI tracker
by Andrey Ponomarenko April 3, 2014

April 3, 2014

Hi, The libpython library has been added to the ABI tracker: http://upstream-tracker.org/versions/python.html The page lists library versions and changes in API/ABI. -- Andrey Ponomarenko, NTC IT ROSA.

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Negative timedelta strings
by Steven D'Aprano April 2, 2014

April 2, 2014

There's a furious discussion going on at the python-list mailing list, about negative timedelta strings: py> str(timedelta(0, -1)) '-1 day, 23:59:59' This is documented. It's even documented as being "somewhat unusual". I found a tracker item for it, back in July 2010: http://bugs.python.org/issue9430 and that refers back to a discussion on #python-dev, but (as far as I know) that's not archived anywhere. I had a look on the python-dev mailing list around that time, and couldn't … [View More]

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pickle self-delimiting
by Charles-François Natali April 1, 2014

April 1, 2014

Hi, Unless I'm mistaken, pickle's documentation doesn't mention that the pickle wire-format is self-delimiting. Is there any reason why it's not documented? The reason I'm asking is because I've seen some code out there doing its own ad-hoc length-prefix framing. Cheers, cf

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Re: [Python-Dev] [Python-checkins] cpython (3.4): simplify check, since now there are only new-style classes
by Zachary Ware April 1, 2014

April 1, 2014

On Tue, Apr 1, 2014 at 1:21 PM, benjamin.peterson <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/abb85902ce79 > changeset: 90090:abb85902ce79 > branch: 3.4 > parent: 90088:4a2dabac976d > user: Benjamin Peterson <benjamin(a)python.org> > date: Tue Apr 01 14:20:56 2014 -0400 > summary: > simplify check, since now there are only new-style classes > > files: > Lib/urllib/request.py | 7 ++----- > … [View More]

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Adding a readinto1 method to BufferedReader
by Nikolaus Rath April 1, 2014

April 1, 2014

Hello, The BufferedReader (and BufferedRWPair) classes both have a read1() method in addition to the regular read() method to bypass the internal buffer. This is quite useful if you need to do some buffered reading (e.g. to parse a header) followed by a lot of bulk data that you want to process as it streams in. However, the readinto() method does not have a corresponding readinto1() method. I would like to add this method. I have proposed a patch in http://bugs.python.org/issue20578. Are … [View More]

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