I found that this error
Exception RuntimeError: 'maximum recursion depth exceeded in __subclasscheck__' in <type 'exceptions.AttributeError'> ignored
occurs when attempting to copy (copy.copy(inst)) an instance of a class that
looks like this
class LazyParagraph(_LazyMixin,TTParagraph):
SUPER=TTParagraph
_CLEAN_SPACE=1
however, whilst debugging I found the error disappeared when I tried to
determine what accesses were being made on this instance during the copy. If I
use this code
class _LazyParagraph(_LazyMixin,TTParagraph):
SUPER=TTParagraph
_CLEAN_SPACE=1
class LazyParagraph(_LazyParagraph):
def __getattr__(self,a):
return getattr(_LazyParagraph,a)
then instances of the new lazy paragraph don't cause a problem. This looks
awfully fragile to me, and I haven't really got any closer to understanding
what's going on. Anyone got any ideas?
I have attempted to abstract the problem, but so far I haven't found the vital
bits.
--
Robin Becker
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