There are problems getting pylint to recognise PyQt4, meaning pylints output is
next to useless, filled with messages saying classes do not exist.
In case anyone else is suffering this problem, I've attached an email I sent to
the pylint author containing a patch that will fix the issue.
I hope its useful to someone else - if anyone can cast light on why the bus
errors might occur when pylint processes QtCore before QtGui that would be
great too
The Bus Error occurs on my OSX 10.5 box as
0 sip.so 0x054e5493 compareTypeDef + 13
1 libSystem.B.dylib 0x90f5c553 bsearch + 51
2 sip.so 0x054e5512 sip_api_find_type + 66
3 _qt.so 0x01cc1069
Chimera::parse_cpp_type(QByteArray const&) + 365
4 _qt.so 0x01cc12dd Chimera::parse(QByteArray
const&, char const*) + 333
5 _qt.so 0x01cc5854 qpycore_get_lazy_attr + 368
6 sip.so 0x054e74bb add_all_lazy_attrs + 496
7 sip.so 0x054e75b0 sipWrapperType_getattro + 38
8 org.python.python 0x001e29c5 recursive_isinstance + 277
9 org.python.python 0x0024195f type___instancecheck__ + 31
cheers
derek
-----------------------------
Hello,
The more recent releases of PyQt4 seem to break pylint ... pylint will emit the
following errors
(i) unable to find submodules of PyQt4
main.py:3: [E0611] No name 'QtCore' in module 'PyQt4'
main.py:4: [E0611] No name 'QtGui' in module 'PyQt4'
(ii) as a result, all use of classes from eg QtGui, or inheritors from them,
spark lots of errors
main.py:11: [E1101, MyValidator] Module 'PyQt4.QtGui2' has no 'QValidator'
member
main.py:33: [E1101, DaycountWidget.__init__] Instance of 'DaycountWidget'
has no 'setEditable' member
I've tracked down the problem I believe ...
* PyQt4.QtCore's namespace has instances of a c-module defined type called
pyqtSignal
* pylint believes these are methoddescriptors [inspect.ismethoddescriptor(.) ->
returns true ]
* However, they do not have __name__ or __doc__ defined, which
logilab/astng/raw_building.py:object_build_methoddescriptor expects
As a result pylint basically refuses to load the Qt modules and this causes all
subsequent errors.
How to fix? The following patch will avoid the error
--- logilab/astng/builder.py.orig 2009-07-27 18:43:54.000000000 +1200
+++ logilab/astng/builder.py 2009-07-27 18:44:57.000000000 +1200
@@ -194,8 +194,12 @@
# recursion
self.object_build(class_node, member)
elif ismethoddescriptor(member):
- assert isinstance(member, object)
- object_build_methoddescriptor(node, member)
+ # avoid objects without __name__, they're not what they seem
...
+ # (eg PyQt4.QtCore.pyqtSignal instances)
+ if hasattr(member, "__name__") and hasattr(member, "__doc__"):
+ assert isinstance(member, object)
+ object_build_methoddescriptor(node, member)
+ else: attach_dummy_node(node, name, member)
elif isdatadescriptor(member):
assert isinstance(member, object)
object_build_datadescriptor(node, member, name)
After this patch pylint seems to work as expected. However users must ensure
their code imports PyQt4.QtGui before PyQt4.QtCore or a bus error will occur
when running pylint. (I have no idea why ... within a python program itself it
doesn't mind the order in which they are imported).
Hope this is useful, I know that there are a few posts to newsgroups wondering
how to fix this problem
Derek.
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