2010-09-23 18:22:20 Phil Thompson napisał(a): > On Wed, 22 Sep 2010 16:16:05 +0200, Arfrever Frehtes Taifersar Arahesis > <arfrever....@gmail.com> wrote: > > 2010-09-19 22:58:26 Phil Thompson napisał(a): > >> On Sun, 19 Sep 2010 22:55:17 +0200, Arfrever Frehtes Taifersar Arahesis > >> <arfrever....@gmail.com> wrote: > >> > 2010-09-19 15:24:53 Phil Thompson napisał(a): > >> >> On Fri, 17 Sep 2010 20:51:55 +0200, Arfrever Frehtes Taifersar > >> >> Arahesis > >> >> <arfrever....@gmail.com> wrote: > >> >> > I use SIP 4.11.1 and PyQt4 4.7.6. > >> >> > > >> >> > $ python3.1 -c 'import PyQt4.uic.Compiler' > >> >> > $ python3.2 -c 'import PyQt4.uic.Compiler' > >> >> > Traceback (most recent call last): > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/Compiler/proxy_type.py", > >> >> > line 16, in __getattribute__ > >> >> > return type.__getattribute__(cls, name) > >> >> > AttributeError: type object 'ProxyBase' has no attribute 'module' > >> >> > > >> >> > During handling of the above exception, another exception > occurred: > >> >> > > >> >> > Traceback (most recent call last): > >> >> > File "<string>", line 1, in <module> > >> >> > File "/usr/lib64/python3.2/site-packages/PyQt4/uic/__init__.py", > >> line > >> >> 3, > >> >> > in <module> > >> >> > from PyQt4.uic.Compiler import indenter, compiler > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/Compiler/compiler.py", > >> >> line > >> >> > 5, in <module> > >> >> > from PyQt4.uic.Compiler import qtproxies > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/Compiler/qtproxies.py", > >> >> > line 8, in <module> > >> >> > from PyQt4.uic.port_v3.proxy_base import ProxyBase > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/port_v3/proxy_base.py", > >> >> > line 4, in <module> > >> >> > class ProxyBase(metaclass=ProxyType): > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/Compiler/proxy_type.py", > >> >> > line 11, in __init__ > >> >> > if not hasattr(args[0], "module"): > >> >> > File > >> >> > > >> "/usr/lib64/python3.2/site-packages/PyQt4/uic/Compiler/proxy_type.py", > >> >> > line 19, in __getattribute__ > >> >> > from PyQt4.uic.Compiler.qtproxies import LiteralProxyClass > >> >> > ImportError: cannot import name LiteralProxyClass > >> >> > >> >> This looks like a Python 3.2a2 bug. > >> > > >> > If it's really a bug in Python, and not another intentional, > >> incompatible > >> > change, > >> > then could you report it to http://bugs.python.org/ ? > >> > (I use snapshots of Python, updated at least once per week, not > 3.2a2.) > >> > >> It disappears if you add a str(cls) just before the import statement > >> which > >> suggests it's a bug rather than a change. However I don't have enough > >> information to put together a proper bug report. > > > > It's not a bug in Python 3.2 :) . > > > > http://docs.python.org/dev/py3k/whatsnew/3.2.html: > > "The hasattr() function used to catch and suppress any Exception. > > Now, it only catches AttributeError. Under the hood, hasattr() works > > by calling getattr() and throwing away the results. This is necessary > > because dynamic attribute creation is possible using __getattribute__() > > or __getattr__(). If hasattr() were to just scan instance and class > > dictionaries it would miss the dynamic methods and make it difficult > > to implement proxy objects." > > > > The attached patch changes ImportError into AttributeError, which fixes > > 'import PyQt4.uic.Compiler'. > > This doesn't explain the problem... > > - the import of the qtproxies module shouldn't fail so wrapping it in > try/except shouldn't make any difference
I don't know why 'from PyQt4.uic.Compiler.qtproxies import LiteralProxyClass'
initially fails, but it also fails with Python 2.6, 2.7 and 3.1.
You can apply the following patch to see this behavior:
--- pyuic/uic/Compiler/proxy_type.py
+++ pyuic/uic/Compiler/proxy_type.py
@@ -16,7 +16,12 @@
return type.__getattribute__(cls, name)
except AttributeError:
# Avoid a circular import.
- from PyQt4.uic.Compiler.qtproxies import LiteralProxyClass
+ try:
+ from PyQt4.uic.Compiler.qtproxies import LiteralProxyClass
+ print("'from PyQt4.uic.Compiler.qtproxies import
LiteralProxyClass' succeeded")
+ except ImportError:
+ print("'from PyQt4.uic.Compiler.qtproxies import
LiteralProxyClass' failed")
+ raise
return type(name, (LiteralProxyClass, ),
{"module": moduleMember(type.__getattribute__(cls,
"module"),
Try to import PyQt4.uic.Compiler after applying this patch.
> - if Python is no longer suppressing certain exceptions then you would
> expect to see new exceptions raised, not a segfault
I see exceptions, not a segmentation fault.
> - if adding a call to str(), which shouldn't have any side effects, avoids
> the segfault then that implies a memory corruption problem.
str(x) calls x.__str__(), which can have side effects.
--
Arfrever Frehtes Taifersar Arahesis
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