Rafe wrote:
> Can anyone explain why this is happening?
When an attribute error is raised that is an indication that the requested
attribute doesn't exist, and __getattr__() must be called as a fallback.
> I can hack a work-around,
> but even then I could use some tips on how to raise the 'real'
> exception so debugging isn't guesswork.
Look at the problem again, maybe you can find a solution without
__getattr__() and use only properties.
Otherwise you have to wrap your getter with something like
try:
...
except AttributeError:
raise BuggyProperty, None, original_traceback
If you put that functionality into a decorator you get:
import sys
class BuggyProperty(Exception):
pass
def safe_getter(get):
def safe_get(self):
try:
return get(self)
except AttributeError:
t, e, tb = sys.exc_info()
raise BuggyProperty("AttributeError in getter %s(); "
"giving original traceback"
% get.__name__), None, tb
return property(safe_get)
class A(object):
@safe_getter
def attr(self):
return self.m(3)
def m(self, n):
if n > 0:
return self.m(n-1)
raise AttributeError("it's a bug")
def __getattr__(self, name):
return "<%s>" % name
A().attr
Peter
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