#131 Can't use PyChecker on Zope code

[Andrew Bennetts]

If I try to use PyChecker on my code that uses Zope
(2.6.2), I get the following warnings and error:

warning: couldn't find real module for class <extension
class Base at 401eb480> (module name: None)
warning: couldn't find real module for class <extension
class ExtensionClass at 401eb620> (module name: None)
Traceback (most recent call last):
File "/usr/lib/site-python/pychecker/checker.py",
line 673, in ?
sys.exit(main(sys.argv))
File "/usr/lib/site-python/pychecker/checker.py",
line 659, in main
warnings = warn.find(getAllModules(), _cfg,
suppressions)
File "/usr/lib/site-python/pychecker/warn.py", line
593, in find
globalRefs, warnings, suppressions)
File "/usr/lib/site-python/pychecker/warn.py", line
494, in _findClassWarnings
_checkOverridenMethods(method.function,
baseClasses, warnings)
File "/usr/lib/site-python/pychecker/warn.py", line
339, in _checkOverridenMethods
if func.func_name != utils.INIT and
File "/usr/lib/site-python/pychecker/function.py",
line 142, in same_signature
return _co_flags_equal(base_func_code,
func.func_code) and
File "/usr/lib/site-python/pychecker/function.py",
line 130, in _co_flags_equal
return (o1.co_flags & _CO_FLAGS_MASK) ==
(o2.co_flags & _CO_FLAGS_MASK)
AttributeError: FuncCode instance has no attribute
'co_flags'

[Andrew Bennetts]

Logged In: YES
user_id=50945

Btw, here is a simple 2-line example file to demonstrate the
problem:

import ZODB
from OFS.Folder import Folder

[Kenneth J. Pronovici]

Logged In: YES
user_id=1168720

On my Debian system, I can reproduce this with Python 2.2
and Zope 2.6.4 and then with Python 2.3 and 2.4 and Zope
2.7.4, using the short example submitted by spiv in late 2003.

[Kenneth J. Pronovici]

Logged In: YES
user_id=1168720

The Zope class Shared.DC.Scripts.Signature.FuncCode is the
cause of this problem and a number of other similar problems
in the code. It is missing quite a few attributes that
pychecker relies on.

I have submitted patch #1168816 which proposes one way to
deal with this problem, basically by ignoring "broken" Zope
classes when we have the chance rather than blowing out or
having to special-case every piece of code that uses a
missing attribute. After my patch is applied, pychecker
completes normally, although there are a huge number of
Zope-related warnings.