Doing this provides significant performance gains for runtime startup (~15% with all the imported modules frozen). We don't yet freeze all the imported modules because there are a few hiccups in the build systems we need to sort out first. (See bpo-45186 and bpo-45188.)
Note that in PR GH-28320 we added a command-line flag (-X frozen_modules=[on|off]) that allows users to opt out of (or into) using frozen modules. The default is still "off" but we will change it to "on" as soon as we can do it in a way that does not cause contributors pain.
https://bugs.python.org/issue45020
Adds a new option in trace that allows tracing runnable modules. It is
exposed as `--module module_name` as `-m` is already in use for another
argument.
Deprecated passing the following arguments as keyword arguments:
- "func" in functools.partialmethod(), weakref.finalize(),
profile.Profile.runcall(), cProfile.Profile.runcall(),
bdb.Bdb.runcall(), trace.Trace.runfunc() and
curses.wrapper().
- "function" in unittest.addModuleCleanup() and
unittest.TestCase.addCleanup().
- "fn" in the submit() method of concurrent.futures.ThreadPoolExecutor
and concurrent.futures.ProcessPoolExecutor.
- "callback" in contextlib.ExitStack.callback(),
contextlib.AsyncExitStack.callback() and
contextlib.AsyncExitStack.push_async_callback().
- "c" and "typeid" in the create() method of multiprocessing.managers.Server
and multiprocessing.managers.SharedMemoryServer.
- "obj" in weakref.finalize().
Also allowed to pass arbitrary keyword arguments (even "self" and "func")
if the above arguments are passed as positional argument.
The concept of .pyo files no longer exists. Now .pyc files have an
optional `opt-` tag which specifies if any extra optimizations beyond
the peepholer were applied.
importlib._bootstrap is now frozen into Python/importlib.h and stored
as _frozen_importlib in sys.modules. Py_Initialize() loads the frozen
code along with sys and imp and then uses _frozen_importlib._install()
to set builtins.__import__() w/ _frozen_importlib.__import__().
Various tests fail when run under coverage. A primary culprit is refcount tests
which fail as the counts are thrown off by the coverage code. A new decorator
-- test.support.refcount_test -- is used to decorate tests which test refcounts
and to skip them when running under coverage. Other tests simply fail because
of changes in the system (e.g., __local__ suddenly appearing).
Thanks to Kristian Vlaardingerbroek for helping to diagnose the test failures.
Many tests simply didn't care if they unset a pre-existing trace function. This
made test coverage impossible. This patch fixes various tests to put back any
pre-existing trace function. It also introduces test.support.no_tracing as a
decorator which will temporarily unset the trace function for tests which
simply fail otherwise.
Thanks to Kristian Vlaardingerbroek for helping to find the cause of various
trace function unsets.
svn+ssh://pythondev@svn.python.org/python/branches/py3k
with some manual fixes
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r84780 | alexander.belopolsky | 2010-09-13 14:14:34 -0400 (Mon, 13 Sep 2010) | 3 lines
Issue #9315: Fix for the trace module to record correct class name
when tracing methods. Unit tests. Patch by Eli Bendersky.
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r84781 | alexander.belopolsky | 2010-09-13 14:15:33 -0400 (Mon, 13 Sep 2010) | 1 line
Removed debugging setting
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svn+ssh://pythondev@svn.python.org/python/branches/py3k
........
r83140 | alexander.belopolsky | 2010-07-25 11:02:55 -0400 (Sun, 25 Jul 2010) | 5 lines
Issue #9315: Renamed test_trace to test_sys_settrace and
test_profilehooks to test_sys_setprofile so that test_trace can be
used for testing the trace module and for naming consistency.
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r83141 | alexander.belopolsky | 2010-07-25 11:05:42 -0400 (Sun, 25 Jul 2010) | 1 line
Corrected comments on where settrace and setprofile are tested.
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svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r83140 | alexander.belopolsky | 2010-07-25 11:02:55 -0400 (Sun, 25 Jul 2010) | 5 lines
Issue #9315: Renamed test_trace to test_sys_settrace and
test_profilehooks to test_sys_setprofile so that test_trace can be
used for testing the trace module and for naming consistency.
........
r83141 | alexander.belopolsky | 2010-07-25 11:05:42 -0400 (Sun, 25 Jul 2010) | 1 line
Corrected comments on where settrace and setprofile are tested.
........
Eric Snow
Hai Shi
Serhiy Storchaka
Min ho Kim
Mario Corchero
Berker Peksag
Michael Selik
Kyle Altendorf
Senthil Kumaran
Brett Cannon
Alexander Belopolsky
Ezio Melotti
Vinay Sajip
Brett Cannon
Georg Brandl