ImportError.
The exception is raised by import when a module could not be found.
Technically this is defined as no viable loader could be found for the
specified module. This includes ``from ... import`` statements so that
the module usage is consistent for all situations where import
couldn't find what was requested.
This should allow for the common idiom of::
try:
import something
except ImportError:
pass
to be updated to using ModuleNotFoundError and not accidentally mask
ImportError messages that should propagate (e.g. issues with a
loader).
This work was driven by the fact that the ``from ... import``
statement needed to be able to tell the difference between an
ImportError that simply couldn't find a module (and thus silence the
exception so that ceval can raise it) and an ImportError that
represented an actual problem.
Currently import does not use these attributes as they are planned
for use by importlib (which will be another commit).
Thanks to Filip Gruszczyński for the initial patch and Brian Curtin
for refining it.
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.
namespace if it occurs as a free variable in a nested block. This limitation
of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF).
This sample was valid in 2.6, but fails to compile in 3.x without this change::
>>> def f():
... def print_error():
... print(e)
... try:
... something
... except Exception as e:
... print_error()
... # implicit "del e" here
This sample has always been invalid in Python, and now works::
>>> def outer(x):
... def inner():
... return x
... inner()
... del x
There is no need to bump the PYC magic number: the new opcode is used
for code that did not compile before.
svn+ssh://pythondev@svn.python.org/python/trunk
........
r77088 | georg.brandl | 2009-12-28 09:34:58 +0100 (Mo, 28 Dez 2009) | 1 line
#7033: add new API function PyErr_NewExceptionWithDoc, for easily giving new exceptions a docstring.
........
match Python 2.5 speed despite the __instancecheck__ / __subclasscheck__
mechanism. In the process, fix a bug where isinstance() and issubclass(),
when given a tuple of classes as second argument, were looking up
__instancecheck__ / __subclasscheck__ on the tuple rather than on each
type object.
Reviewed by Benjamin Peterson and Raymond Hettinger.
svn+ssh://pythondev@svn.python.org/python/trunk
........
r65339 | amaury.forgeotdarc | 2008-07-31 23:28:03 +0200 (jeu., 31 juil. 2008) | 5 lines
#3479: unichr(2**32) used to return u'\x00'.
The argument was fetched in a long, but PyUnicode_FromOrdinal takes an int.
(why doesn't gcc issue a truncation warning in this case?)
........
r65340 | amaury.forgeotdarc | 2008-07-31 23:35:03 +0200 (jeu., 31 juil. 2008) | 2 lines
Remove a dummy test that was checked in by mistake
........
r65342 | amaury.forgeotdarc | 2008-08-01 01:39:05 +0200 (ven., 01 août 2008) | 8 lines
Correct a crash when two successive unicode allocations fail with a MemoryError:
the freelist contained half-initialized objects with freed pointers.
The comment
/* XXX UNREF/NEWREF interface should be more symmetrical */
was copied from tupleobject.c, and appears in some other places.
I sign the petition.
........
Brett Cannon
Andrew Svetlov
Philip Jenvey
Nadeem Vawda
Richard Oudkerk
Benjamin Peterson
Antoine Pitrou
Nick Coghlan
Brett Cannon
Ezio Melotti
Amaury Forgeot d'Arc
Eric Smith
Georg Brandl