[Zope-dev] KeywordIndex and PersistentList (Bug?)

[Chris McDonough]

There is a workaround for this in the DocumentTemplate package.  It
implements a "safe_callable" function that seems to do the right thing
with ext class instances:

def safe_callable(ob):
    # Works with ExtensionClasses and Acquisition.
    if hasattr(ob, '__class__'):
        if hasattr(ob, '__call__'):
            return 1
        else:
            return type(ob) in ClassTypes
    else:
        return callable(ob)


On Mon, 2002-11-25 at 13:01, Jeremy Hylton wrote:
> It must be any instance of an ExtensionClass.  I think Python
> instances used to be true-for-callable as well, but that must have
> been fixed.
> 
> Python 2.1.3 (#5, Aug 15 2002, 10:41:31) 
> [GCC 2.95.3 19991030 (prerelease)] on linux2
> Type "copyright", "credits" or "license" for more information.
> >>> from ZODB.PersistentList import *
> >>> callable(PersistentList())
> 1
> 
> Jeremy
> 
> 
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